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Fulltext Knowledge and attitude towards blood donation among non blood donor residents of Kuala Terengganu at Hospital Sultanah Nur Zahirah, Kuala Terengganu

Sarah Mat Noh, Faraizah Abdul Karim, Mohd Muhaimin Kambali, Hafizuddin Mohamed Fauzi

Malaysian Journal of Medicine and Health Sciences, 2019;15(1):53-62.
MyJurnal

Blood supply shortage is a worldwide problem including Malaysia. According to statistical data from 2011 to 2015, Terengganu which is one of the states in Malaysia has the lowest blood donation rate. The objective of this study was to determine the knowledge and attitude score towards blood donation and their associated factors among nondonors of Kuala Terengganu. Methods: This was a cross-sectional study using a self-administered questionnaire involving systematically random sampling of 320 nondonors attending Hospital Sultanah Nur Zahirah. Data were analysed using Multiple Logistic Regression and Pearson correlation. Results: The mean knowledge and attitude scores were 5.19 (1.87) and 70.79 (8.19), respectively. Sixty-four percent (64.69%) and 92.81% of the participants have good knowledge and attitude, respectively. Gender, education level, and occupation have a significant association with knowledge, while education level and occupation were found to be significantly associated with attitude. No significant association found between the knowledge and attitude level. Most reported barriers to blood donation were a refusal to give blood to other religion and race. The main source to acquire information pertaining to blood donation was mainly from social media. Conclusion: Refusal of giving blood to other religion and race is recognised as the main issue that hinders participants to donate their blood. Thus, proper education and aggressive promotion regarding blood donation are needed especially among the nondonor in this region of Malaysia.

Matched MeSH terms: Logistic Models
Correlation of cognitive impairment with constipation and renal failure

Eshkoor SA, Tengku Aizan Hamid, Chan YM

Sains Malaysiana, 2016;45:1357-1361.

The improvement of health care support has greatly extended the average life expectancy over the last 50 years, which
has increased the rate of cognitive decline consequently. The avoidance of risk factors such as toxins, stress and somatic
diseases can be protective against the reduction of cognitive function in the elderly. This study aimed to determine the
effects of socio-demographic factors, constipation and renal failure on cognitive status among 2322 samples who were
the non-institutionalized Malaysian elderly. The multiple logistic regression analysis was applied to estimate the risk of
such factors on cognitive decline in subjects. Approximately, 77.54% of samples experienced cognitive impairment. The
results showed that advanced age (odds ratio (OR) = 1.03), Malay ethnic (OR = 2.15), constipation (OR = 3.31) and renal
failure (OR= 4.42), significantly increased the risk of cognitive impairment in subjects (p<0.05). In addition, education
(OR = 0.38) significantly reduced the risk. However, we concluded that age, Malay ethnic, constipation and renal failure
increased the risk of cognitive impairment in subjects but education reduced the risk.

Matched MeSH terms: Logistic Models
Fulltext Relative age effect in U-16 Asian Championship Soccer Tournament

Pathmanathan K. Suppiah, Jeffrey Low Fook Lee, Abdul Muiz Nor Azmi, Hasnol Noordin, Rabiu Muazu Musa

Movement Health & Exercise, 2020;9(1):1-8.
MyJurnal

Athletes born at the beginning of the year may present advantages in terms of physical characteristics, motor ability or cognitive knowledge that could increase their chances for selection against their peers. This circumstance could lead to the over-representation of older athletes in an age-defined competition, a phenomenon commonly referred to as relative age effect (RAE). Although, a number of studies have demonstrated that RAE is apparent in youth soccer, such studies rarely investigate the performance advantage that likely exists across the birth month of the athletes. The current study aims to determine the presence of RAE in the under 16 Asian Football Confederation Championship (AFC); investigate the effect of RAE on the team qualification success; as well as ascertain the existence of RAE in choice of playing position amongst the soccer players. Data for the 2018 AFC under 16 qualifications matches were obtained from the AFC. A total of 719 players from 32 countries participated in the qualification competitions. Chi-square for goodness fit is used to determine the existence of the RAE across the players’ month of birth while logistic regression is applied to analyze the differences of the quartiles’ distribution with respect to the quartile, qualification status (qualifier or non-qualifier) as well as the playing position of the players. The results demonstrate the presence of RAE in the AFC under 16 soccer tournaments [χ2(4) = 21.53; p < 0.001] with the largest number of older players dominating the qualified team. Likewise, a substantial difference is observed with regards to the quartile and various playing positions of the players at p < 0.05.

Matched MeSH terms: Logistic Models
Fast and robust parameter estimaation in the application of fuzzy logistic equations in population growth

Nor Atirah Izzah Zulkefli, Yeak Su Hoe, Normah Maan

MATEMATIKA, 2019;35(2):249-259.
MyJurnal

In this paper, extended Runge-Kutta fourth order method for directly solving the fuzzy logistic problem is presented. The extended Runge-Kutta method has lower number of function evaluations, compared with the classical Runge-Kutta method. The numerical robustness of the method in parameter estimation is enhanced via error minimization in predicting growth rate and carrying capacity. The results of fuzzy logistic model with the estimated parameters have been compared with population growth data in Malaysia, which indicate that this method is more accurate that the data population. Numerical example is given to illustrate the efficiency of the proposed model. It is concluded that robust parameter estimation technique is efficient in modelling population growth.

Matched MeSH terms: Logistic Models
Fulltext Dopamine transporter 1 (DAT1) rs40184 single nucleotide polymorphism is not associated with the Malaysian major depressive disorder subjects

Aldoghachi, Asraa Faris, Cheah, Pike-See, Normala Ibrahim, Lye, Munn Sann, Ling, King-Hwa

Neuroscience Research Notes, 2019;2(4):5-13.
MyJurnal

Major depressive disorder (MDD) is a serious mental illness with a multifactorial aetiology that was shown to influence behaviour and affect cognition. Previous research has favoured the involvement of dopamine in the aetiology of the disorder, and since one of the critical regulators of the dopamine levels and activity in the brain is DAT1, the present study investigated the association of a single nucleotide polymorphism in the DAT1gene (rs40184) and MDD in the Malaysian population. A total of 300cases and 300 matched controls were recruited from four Klang valley hospitals and were screened for DAT1rs40184 using high resolution melting assays. The allele and genotype frequencies were analysed by using Chi-square. Hardy Weinberg equilibrium for the distribution of alleles and genotypes was tested by using Chi-square. Determination of the association between rs40184 and MDD was achieved by conditional logistic regression using SPSS. In the present study, no significant association was obtained between DAT1and MDD in the Malaysianpopulation.

Matched MeSH terms: Logistic Models
Fulltext Prevalence of underweight and effect of nutritional status on academic performance of primary school children in Chapainawabganj district, Bangladesh

Md Galam, H., Md Saimul, I., Kazi Enamul, H., Md Ashraful, I., Asma, Mamun, Kamruzzaman, M., et al.

Malays J Nutr, 2014;20(1):71-81.
MyJurnal

Introduction: The high prevalence of underweight among children is a serious health concern in Bangladesh. Nutritional status influences students' academic performance directly or indirectly. This study aimed to determine factors that affect the academic performance of students in primary schools. Methods: Data were collected from several schools and madrasahs in Chapainawabganj district, Bangladesh using multistage stratified sampling with proportional allocation technique. Results: The prevalence of underweight children was 32.3%, with 43.0% of them being girls and 21.4% boys. Multiple logistic regression analysis demonstrated that normal weight children were more likely (p

Matched MeSH terms: Logistic Models
Fulltext Capsule Commentary on Cheah et al., Ethnic Differences in Participation in Medical Check-ups Among the Elderly: Evidence from Malaysia

Yuan Y

J Gen Intern Med, 2020 09;35(9):2834.
PMID: 32232666 DOI: 10.1007/s11606-020-05794-2
Matched MeSH terms: Logistic Models
Fulltext Non-Muslims’ awareness of Halal principles and related food products in Malaysia

International Food Research Journal, 2010;17(3):667-674.
MyJurnal

Although the Halal concept has not been a major element among non-Muslim consumers living in an Islamic country, whether the non-Muslim consumers are aware of the underlying advantages that come with Halal food products or their viewpoints arising from their religious belief, are some intriguing questions that need to be answered. Thus the objective of the study explore the underlying determinants that are likely to influence non-Muslim consumers’ perceptions and attitudes towards Halal concept and Halal food products in Malaysia in lieu of new paradigm in emerging global issues on sustainability, environmental, food safety and animal welfare. A survey was conducted in the Klang Valley where 400 non-Muslim respondents were interviewed via structured questionnaires to gather information on their awareness and attitude towards Halal food products in the Malaysian food market. Descriptive statistic was used to identify the socio-economic/ demographic characteristics and attitudes of the respondents toward the Halal food principles. The logit model
was used to determine the extent to which selected socio-economic/demographic characteristics influenced
the respondents’ attitude and understanding on Halal principles and Halal food products. The results of this
study suggest that non-Muslim consumers are aware of the existence of Halal food, Halal principles and the
advantages of Halal way in slaughtering the animals. This can be shown by their significant awareness that
Halal is not only the way Muslim slaughter their animals but also relates to environmental, sustainability,
animal welfare and food safety. In general, various socio-economic/demographic factors such as education
level, older generation, those who are more religious and the urban dweller seem to more likely to be aware of the advantages of Halal principles.

Matched MeSH terms: Logistic Models
Fulltext Factors influencing locum practice among government medical officers in Negri Sembilan and Malacca

Mohd Anis, H., Syed Mohamed, A., Ahmad Razid, S.

Malaysian Journal of Public Health Medicine, 2006;6(2):20-25.
MyJurnal

A cross»sectional study using self administered questionnaires on sociodemographic and service factors influencing locum practice was undertaken among all Government medical officers in Negeri Sembilan and Malacca for 8 months from 2 7 April 1999 to 9. l January ZOOO. Universally chosen samples were made of 335 Government medical officers from both the 'Public Health Division' and ”Hospital Division' and from 154 who responded, only 147 samples were chosen and analysed in the study. Results revealed that locum were still being practised by 51 .9% of male Government medical officers, 41 .0% of Government medical ofhcers aged less than 30 years, 43.4% of Government medical officers who had served less than 5 years and 55.6% of Government medical officers who had earned nett income less than RM 1 000. Meanwhile, 80.9% of Government medical officers who had earned gross income more than RM 5 OOO did not practice locum during the study. Logistic Regression analysis then revealed that locum practice among Government medical ofhcers can positively be influenced by gender (male) , Malay ethnic, service duration of less than 5 years, practice in the 'Public Health Divisionl and nett income of less than RM 1 OOO (p

Matched MeSH terms: Logistic Models
Fulltext Differentiation of ripe banana flour using mineral composition and logistic regression model

Abbas F.M.A., Saifullah, R., Azhar, M.E.

International Food Research Journal, 2009;16(1):83-87.
MyJurnal

Cavendish (Musa paradisiaca L, cv cavendshii) and Dream (Musa acuminata colla. AAA, cv ‘Berangan’) banana flours were prepared from ripe fruits collected from eleven markets located in Penang, Malaysia. The mineral composition (Na, K, Ca, Mg, Cu, Fe, Mn, Zn) of the flour were analyzed by atomic absorption spectrophotometer and the data obtained were analyzed using logistic regression model. Ripe banana flours were rich source of K and a fair source of other minerals, however logistic regression model identified Mg as an indicator to discriminate between the two types of banana flour affording 100 % correct assignation. Based on this result, mineral analysis may be suggested as a method to authenticate ripe banana flour. This study also presents the usefulness of logistic regression technique for analysis and interpretation of complex data.

Matched MeSH terms: Logistic Models
Fulltext Beta carotene intake and oral cancer risk

Ng LC, Helen, Razak IA, Ghani WMN, Marhazlinda J, Rahman ZAA, Norlida A, et al.

Ann Dent, 2015;22(1):2-5.
MyJurnal

This study aims to identify the relationship between dietary intakes of β-carotene with risk of oral cancer.
Methods: A hospital-based, case-control study was conducted on 306 Malaysians who seek treatment at participating centres/hospitals. Subjects selected from the Malaysian Oral Cancer Data and Tissue Banking System (MOCDTBS) consisted of 153 cases and 153 controls that were matched for gender, age (±5 years) and ethnicity. Food consumption was measured using Food Frequency Questionnaire (FFQ). NutrieMart Version 2.0.0 software was used to estimate daily nutrient of each subject from the FFQ. Logistic Regression analysis was conducted to compute the odds ratio (OR) for intakes of β-carotene and oral cancer risk.
Results: Intake of β-carotene was found to be not associated with risk of oral cancer (OR 0.83, 95%CI: 0.42-1.66, p>0.05).
Conclusion: No significant association was found between dietary intakes of β-carotene with oral cancer risk in this study population.

Matched MeSH terms: Logistic Models
Fulltext Occupational stress among white collar employees in Esfahan steel company, Iran

Lotfizadeh, Masoud, Maimaiti, Namaitijiang, Noor Hassim Ismail

Malaysian Journal of Public Health Medicine, 2014;14(1):79-81.
MyJurnal

Occupational stress is one of the major health hazards among blue and white-collar workers. However there is no data on occupational stress among white-collar workers in Iran. Aim of this study was to investigate occupational stress among white collar employees in Esfahan Steel Company organization (ESCO), Iran. A cross-sectional survey was conducted through face to face interview using validated standardized questionnaire on occupational stress among 200 white-collar workers from ESCO who agreed to participate in the study, the response rate of participation was 100%. The logistic regression test was used to determine significant associated factors of occupational stress among the study sample.. It is found that among the six items measuring source of stress, the highest source of stress related to economic problem, 117 (59.7%). The statistical analysis showed sources of stress such as task type (p=0.0001), economic problem (p=0.0001), work environment (p=0.0001) and children problem (p=0.05) were significantly associated with having stress among the workers. We found that around half of the white collar workers were under stress at ESCO. Main sources of the occupational stress of white colour workers related to their work environment, economic problem; task type, and related their children.

Matched MeSH terms: Logistic Models
Fulltext Public health inspectors enforcement in Selangor, Malaysia

Sharifa Ezat, A., Aljunid, S.M.

Malaysian Journal of Public Health Medicine, 2005;5(1):56-61.
MyJurnal

A cross·sectional study was done to determine the capacity of Public Health Inspectors in Selangor using a seh administered questionnaire and universal sampling, to determine the enforcement of public health legislation and its influencing factors. A total of 99 respondents from the District Health Offices and 100 respondents from the Local Health Departments participated. The level of enforcement is generally low in all the units except for the Food Unit and Sanitary and Hygiene Units. Factors influencing enforcement of Public Health Legislations are the unit where the respondents worlc and the length of service with the unit. Further analysis using multiple logistic regression, found that respondents from the Food Unit (OR ZZ; 95% C1: 7 .9-58.9 ) , being in the
U8 category (OR 5; 95% C1: l.4» 17.6), service offour years and above in the same unit (OR 6; 95% C1: 2.2»13.8) , received service rewards (OR 3; 95% C1 : 1.2· 6.9); low exposure to bribery (OR 46; 95% C1: 2.3·100.0) and offered bribes while on the field (OR 3; 95% C1: 1.02» 4.8) have higher kvel enforcement performance. Attention must be given to the enforcement organization with respect to duration of service, service awards and monitoring of bribes exposure to help develop the enforcement of public health legislations.

Matched MeSH terms: Logistic Models
Fulltext Activities of Daily Living and Determinant Factors among Older Adult Subjects with Lower Body Fracture after Discharge from Hospital: A Prospective Study

Ibrahim NI, Ahmad MS, Zulfarina MS, Zaris SNASM, Mohamed IN, Mohamed N, et al.

Int J Environ Res Public Health, 2018 05 16;15(5).
PMID: 29772744 DOI: 10.3390/ijerph15051002

Fracture is a type of musculoskeletal injury that contributes to an inability to perform daily activities. The objective of this study was to evaluate activities of daily living (ADL) of older adult patients with lower body fracture and to determine factors influencing ADL. Patient's ADL was assessed at pre-fracture, ward admission and post-discharge phases using the Katz ADL questionnaire. There were 129 subjects at pre-fracture and ward phases and 89 subjects at discharge phase. There were four independent variables; age, gender, type of fracture and ability to walk before fracture. Logistic regression models showed that 'age' and 'ability to walk before fracture' were the determinant factors of dependent for 'bathing', 'dressing' and 'toileting'. The 'ability to walk before fracture' was the determinant factor of dependent for 'transferring'. 'Age' and 'gender' were the determinant factors of dependent for 'continence', while 'age' was the determinant factor of dependent for 'feeding'. The ADL score changes were significant across the phases with a reduction in ADL score in the ward admission phase and partial increment during the post-discharge phase. There were improvements in the health outcomes of subjects aged more than 50 years old after 3 months of being discharged from the hospital. In conclusion, age, being female, having a hip fracture and using a walking aid before fracture were the determinants identified in this study.

Matched MeSH terms: Logistic Models
Should Genital Hiatus/Perineal Body Be Measured at Rest or on Valsalva?

Ow LL, Subramaniam N, Kamisan Atan I, Friedman T, Martin A, Dietz HP

Female Pelvic Med Reconstr Surg, 2018 7 7;25(6):415-418.
PMID: 29979358 DOI: 10.1097/SPV.0000000000000608

OBJECTIVE: Genital hiatus (Gh) and perineal body (Pb) are part of the Pelvic Organ Prolapse Quantification assessment system, but it is unclear whether measurements should be taken at rest or on Valsalva. This study was designed to assess the predictive value of Gh and Pb measurements obtained at rest and on Valsalva for signs and symptoms of pelvic organ prolapse (POP).
METHODS: This is a retrospective study involving 416 women who presented to a tertiary urogynecology unit with symptoms of pelvic floor dysfunction. Genital hiatus and Pb were measured at rest and on maximal Valsalva. The strength of association between binary markers of POP and measurements of Gh/Pb was estimated using logistic regression analysis. Receiver operator characteristic statistics were used to compare predictive values of Gh and Pb measurements obtained at rest and on Valsalva.
RESULTS: A total of 451 women were seen during the study period. Thirty-five were excluded owing to missing data, leaving 416. Fifty-four percent (n = 223) complained of POP symptoms. On examination, 80% (n = 332) had significant POP (stage 2+ in anterior or posterior compartments or stage 1+ in the central compartment). On imaging, significant POP was diagnosed in 66% (n = 275). Mean hiatal area was 22 cm (SD, 7; range, 5-49 cm) at rest and 30 cm (SD, 10; range, 11-69 cm) on Valsalva. Genital hiatus and Pb measured on Valsalva were consistently stronger predictors of prolapse symptoms and objective prolapse (by clinician examination and by ultrasound) than at Gh and Pb measured at rest. The corresponding area under the curve values were significantly larger for Gh/Pb measures on Valsalva after adjusting for multiple confounders.
CONCLUSIONS: Genital hiatus/Pb measured on maximal Valsalva is a superior predictor of symptoms and signs of POP compared with Gh/Pb at rest.

Matched MeSH terms: Logistic Models
Maternal education and tetanus immunisation in Indonesia

Mohamed WN

Sains Malaysiana, 1996;25(4):19-29.

This paper examines the influence of maternal education on the acceptance of tetanus toxoid vaccine, using data from two villages in rural Yogyakarta, Indonesia. Maternal education results in increased tetanus toxoid uptake. Irrespective of the level of formal education, correct knowledge of the function of tetanus toxoid is positively associated with the probability of using the vaccine. It is therefore recommended that health education campaign be run to provide correct information on the importance of tetanus toxoid. This study can be used as a model for health programmes in other population with low levels of women education.
Key words: Neonatal tetanus, maternal education, tetanus toxoid, binomial logistic regression, multinomial logistic regression.
Kertas ini mengkaji pengaruh pendidikan ibu ke atas penerimaan vaksin tetanus toxoid, dengan menggunakan data daripada dua buah kampung di pendalaman Yogyakarta, Indonesia. Kajian ini mendapati pendidikan ibu dapat meningkatkan kadar pengambilan tetanus toxiod. Pengetahuan yang tepat tentang kepentingan vaksin tersebut didapati mempunyai hubungan yang positif dengan pengambilannya, tanpa mengira tahap pendidikan wanita. Dengan itu dicadangkan agar kempen pendidikan kesihatan dijalankan untuk menyebarkan maklumat yang jelas ten tang kepentingan tetanus toxoid. Kajian ini boleh dijadikan model bagi program kesihatan untuk populasi lain yang mempunyai tahap pendidikan wanita yang rendah.
Kata kunci: Tetanus neonatal, pendidikan ibu, tetanus toxoid, regresi logistik binomial, regresi logistik multinomial.

Matched MeSH terms: Logistic Models
Fish harvesting management strategies using logistic growth model

Mohamed Faris Laham, Ishtrinayagy S. Krishnarajah, Jamilah Mohd Shariff

Sains Malaysiana, 2012;41:171-177.

This paper studies the harvesting strategies for tilapia fish farming. Two logistic growth models have been used namely constant harvesting and periodic harvesting. Even though tilapia fish farming has been commercialized, the use of mathematical models in determining harvesting strategies has not been widely applied in Malaysia. Logistic growth model is appropriate for population growth of animal when overcrowding and competition resources are taken into consideration. The objectives of this study were to estimate the highest continuing yield from fish harvesting strategies implemented. Secondly, the study predicted the optimum quantity for harvesting that can ensure the tilapia fish supply is continuous. Finally, to compare the results obtained between the two strategies. The best harvesting strategy for the selected fish farm is periodic harvesting. These findings can assist fish farmers to increase the supply to meet the demand for tilapia fish.

Matched MeSH terms: Logistic Models
Fulltext Mobility and fear of falls measuring tools to predict falls risk among malaysian community dwelling older adults. [Abstract]

Ajit Singh DK, Ng ES, Ng CP, Ab Rahman NNA, Pannir Selvam SB

Jurnal Sains Kesihatan Malaysia, 2018;16(101):225-226.
MyJurnal DOI: 10.17576/JSKM-2018-35

Falls is a global health issue among older adults. Identifying measuring tools that can predict falls risk among older adults can assist in early falls risk detection and prevention. Best measuring tools that can predict falls risk among Malaysian community dwelling older adults is not known. The objective of our study was to determine if Timed Up and Go (TUG) test and Activities-Specific Balance Confidence (ABC) scale could be used as a falls risk predictor tools among Malaysian community dwelling older adults. Hundred and six (n = 106) community dwelling older adults who were attending Klinik Kesihatan Cheras participated in this cross sectional study. Falls incidence in the past one year was obtained from the participants. TUG test was performed and ABC scale was administered. Data was analysed using binomial logistic regression and receiver operating curves (ROC). The cut off values identified for TUG test and ABC scale were 9.02 seconds (area under the curve, AUC was 0.711; 95% CI 0.577-0.844) and 82.81% (area under the curve, AUC was 0.682; 95% CI 0.562-0.802) respectively. Hence, older adults with a score of above 9.02 seconds for TUG test and a score of below 82.81% for ABC scale were noted to have a higher risk of falls. Results of this study demonstrated that both TUG test (p < 0.001) and ABC scale (p < 0.01) were significant predictors of falls risk. Our study results indicated that both mobility (TUG test) and fear of falls (ABC scale) measuring tools, with the present cut off values can be used to identify community dwelling older adults who are at a higher risk of falls. Identifying older adults with higher risk of falls can assist the health professionals to optimise falls prevention and management approaches.

Matched MeSH terms: Logistic Models
Performance comparison of serum and urine biomarkers from independent samples for ovarian cancer screening

Song HJ, Kim JD, Park CY, Kim YS, Jeong KS

Sains Malaysiana, 2015;44:1671-1676.

This study compares the diagnostic performance of urine and serum multiple biomarkers for early diagnosis of ovarian
cancer. The sample population includes 119 benign and 101 ovarian cancer patients. The marker combinations used
to compare performance include 16 markers whose concentration values were obtained using the Luminex assay. In
order to identify an optimal marker combination that could classify ovarian cancer and benign patients, the area under
the curve (AUC) is used to evaluate 2-, 3-, and 4-marker combinations and the classification is performed by using
logistic regression. In the case of urine samples, the best AUC values are 87.89% for the 2 protein markers combination,
90.22% for the 3 markers combination, and 92.43% for the 4 marker combination. In contrast, the best AUC values
for serum sample are 92.4% for the 2 marker combination, 93.63% for the 3 marker combination and 94.63% for the
4 marker combination. This study confirmed that combining multiple biomarkers could improve diagnostic accuracy.
Even though the urine sample shows relatively lower performance than serum, urine could be utilized more widely for
its simple usability.

Matched MeSH terms: Logistic Models
Application of Remote Sensing on the Dispersion and Concentration of Total Suspended Sediment Offshore Langat Estuary

Othman A.K., Othman J., Sharifah Mastura S.A.

Sains Malaysiana, 2004;33.

This paper focuses on Langat River basin which is experiencing fast pace land use changes and accelerated soil erosion associated with land clearing and earthwork activities. Land use changes detected from Landsat imageries from 1989-1999 show that urban expansion is the most active, i.e. recording an expansion of 180% over that time period. The major land use reduction is the tropical dipterocarp rainforest located along the upper catchment of the Langat River and the mangrove forest found along Kuala Langat in the west. The 11% decline in the trend of the forest over that decade is anticipated to contribute in the near future. Results from logistic regression on the casual factors of rapid land use changes are attributed to three significant variables namely transport accessibility, population dynamics and agriculture. The eroded material due to land use changes enters into the Langat River systems as suspended sediments and contributed as non point source of pollution. Some finer sediment is being discharged offshore forming sediment plumes at the river estuary. Sediment plumes detected by Landsat TM imageries were analysed. It is found that the dispersion was not extensive and generally the suspended solids existed at low concentration (varying from 10-50 mg/l). This result is unexpected considering the rapid land use and land cover change that is occurring within the basins. These are mainly due to the loss of sediments during flooding into flood plain and active dredging of the river channels.

Matched MeSH terms: Logistic Models

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