5.7 Limitation of the Study
The present cross-sectional study design did not allow for quantitative analysis of risk exposures in para-rubber planters since the measure for dose-responses on an individual level had not been carried out. Nevertheless, because the survey was firstly conducted in this area, it is better to begin the study by having the overall view of the para-rubber planters without any bias so as the real and most important problem could be found which necessitate for further study.
It should be noted that, the physical examination results could show WMSDs during rest period of some planters. This is due to the fact that the interviewed questionnaire and physical examination process was designed to be carried out in January, 12-17 so as not to interfere with the working time of some planters as this was the first survey in this area. In addition, some planters continue stop taping even after rainy season in October to December.
The answers regarding factors which may be associated with WMSDs under this study were subjective in which the answers may be influenced by performance, pain experienced and individual nature. This was evidenced, especially, with related to the answers relevant to musculoskeletal problems such as level of pain or frequency of pain. For example, healthy planters may report lower level of pain while non-healthy planters who perform the same work task situation would rate them as higher level of pain.
5.8 Suggestion for Further Study
5.8.1 The survey method used in this study should also be applied in the study of other agricultural areas so that the results could be compared.
5.8.2 The studies may include work task analysis (OWAS and/or RULA) and EMG to analyze posture during work, indicate local muscle fatigue and workstation dimension.
5.8.3 Case control study or longitudinal study should be conducted in other study in order to investigate the development of WMSD symptoms among para-rubber planters.
5.8.4 Pre and post intervention study should be carried out in specific work task that reported to have high prevalence of WMSD in this study in order to find the appropriate intervention to alleviate WMSD problem.