## 3 Results
### Self-Reported Overall Fatigue and Musculoskeletal Pains by the Degree of Hazard Exposure  
Table 6 shows the distribution of self-reported overall fatigue by the degree of hazard exposure. The interpretation of the percentages in the table is as follows. Among 137 subjects having less than two ADHE of vibration exposure, 20 (14.6%) subjects complained of overall fatigue. Among 80 subjects having two to four ADHE of vibration exposure, 13 (16.3%) subjects complained of overall fatigue. And among 229 subjects having more than four ADHE of vibration exposure, 61 (26.6%) subjects complained of overall fatigue. This interpretation of the table is also applied to Tables 7-10.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{2}{c}{**Gender**} & \multicolumn{4}{c}{**Musculoskeletal Plains**} & \multicolumn{1}{c}{**Overall Fatigue**} \\ \cline{2-6} \multicolumn{2}{c}{} & **Backache** & **Upper Limb Pain** & **Lower Limb Pain** & **Any Pain** & **Overall Fatigue** \\ \hline \multirow{2}{*}{Male} & N = 363 & 25 & 73 & 40 & 91 & 69 \\ \cline{2-6}  & \% & 6.9\% & 20.1\% & 11.0\% & 25.1\% & 19.0\% \\ \hline \multirow{2}{*}{Female} & N = 83 & 9 & 27 & 12 & 31 & 25 \\ \cline{2-6}  & \% & 10.8\% & 32.5\% & 14.5\% & 37.3\% & 30.1\% \\ \hline \multirow{2}{*}{Total} & N = 446 & 34 & 100 & 52 & 122 & 94 \\ \cline{2-6}  & \% & 7.6\% & 22.4\% & 11.7\% & 27.4\% & 21.1\% \\ \cline{2-6}  & \(\chi^{2}\) & 1.502 & 5.991 & 0.775 & 5.127 & 5.015 \\ \cline{2-6}  & \(p\) & 0.159 & 0.014 * & 0.379 & 0.018 * & 0.025 * \\ \hline \hline \end{tabular}
* Significant at 0.05. Note: Any pain = Pain complaints in any one area.  
\end{table}
Table 4: Distribution of subjective musculoskeletal pains and overall fatigue by gender.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{2}{c}{**Age**} & \multicolumn{4}{c}{**Musculoskeletal Plains**} & \multicolumn{1}{c}{**Overall Fatigue**} \\ \cline{2-6} \multicolumn{2}{c}{} & **Backache** & **Upper Limb Pain** & **Lower Limb Pain** & **Any Pain** & **Overall Fatigue** \\ \hline \multirow{2}{*}{\(\leq\)20} & N = 69 & 1 & 5 & 6 & 9 & 9 \\ \cline{2-6}  & \% & 1.4\% & 7.2\% & 8.7\% & 13.0\% & 13.0\% \\ \hline \multirow{2}{*}{30} & N = 104 & 9 & 27 & 12 & 33 & 25 \\ \cline{2-6}  & \% & 8.7\% & 26.0\% & 11.5\% & 31.7\% & 24.0\% \\ \hline \multirow{2}{*}{40} & N = 118 & 9 & 31 & 11 & 35 & 19 \\ \cline{2-6}  & \% & 7.6\% & 26.3\% & 9.3\% & 29.7\% & 16.1\% \\ \hline \multirow{2}{*}{\(\geq\)50} & N = 155 & 15 & 37 & 23 & 45 & 41 \\ \cline{2-6}  & \% & 9.7\% & 23.9\% & 14.8\% & 29.0\% & 26.5\% \\ \hline \multirow{2}{*}{Total} & N = 446 & 34 & 100 & 52 & 122 & 94 \\ \cline{2-6}  & \% & 7.6\% & 22.4\% & 11.7\% & 27.4\% & 21.1\% \\ \hline \multirow{2}{*}{\(\chi^{2}\) test} & \(\chi^{2}\) & 4.820 & 11.077 & 2.737 & 8.649 & 7.673 \\ \cline{2-6}  & \(p\) & 0.185 & 0.011 * & 0.434 & 0.034 * & 0.053 \\ \hline \hline \end{tabular}  
* Significant at 0.05. Note: Any pain = Pain complaints in any one area.  
\end{table}
Table 3: Distribution of subjective musculoskeletal pains and overall fatigue by age group.  
There were significant differences between the overall fatigue complaining group and the non-complaining group in most of the hazards except low-temperature exposure (\(\chi^{2}=3.378\), \(p=0.185\)) and standing posture exposure (\(\chi^{2}=4.062\), \(p=0.131\)). The proportion of the overall fatigue complaining group increases as the ADHE of hazard exposure increases. Exposure to chemical and biological hazards is the major source of overall fatigue, and longer exposure to tobacco smoke shows the highest rate of complaining of overall fatigue (52.6%).