## 3 Results  
### Factors Influencing Overall Fatigue  
The proportion of nurses reporting overall fatigue was 24.7% (114 out of 462). Table 1 displays the results of binomial logistic regression analysis for overall fatigue as the dependent variable. The explanatory power of the model was satisfactory (Nagelk-erke value = 0.419). In addition, the Hosmer-Lemeshow test (\(\chi^{2}\) = 4.653, significance value = 0.702) indicated appropriate goodness of fit, and the prediction accuracy was 83.1%.  
According to the findings of the binomial logistic regression analysis, nurses experience overall fatigue due to several factors. These factors include the type of shift work (\(p\) = 0.007), exposure to vibration (\(p\) = 0.042), maintaining awkward postures (\(p\) = 0.001), performing repetitive motions (\(p\) = 0.017), as well as experiencing complaints of back pain (\(p\) = 0.002) or upper limb pain (\(p\) < 0.001). Rotating shift nurses had a 3.052 times higher likelihood of experiencing overall fatigue compared to day duty nurses. Nurses exposed to vibration for more than 4 h were 5.191 times more likely to complain of overall fatigue than those exposed for less than 2 h. Nurses exposed to awkward postures for 2 to 4 h reported overall fatigue 2.227 times more than those under 2 h. Furthermore, nurses exposed to awkward postures for more than 4 h were 3.120 times more likely to report overall fatigue than those under 2 h. Nurses exposed to repetitive motions for 2 to 4 h were 2.464 times more likely to report overall fatigue than those exposed to repetitive motions for less than 2 h. Similarly, nurses who engaged in repetitive motions for more than 4 h were 2.464 times more likely to experience overall fatigue than those for less than 2 h. Nurses who complained of back pain were 2.818 times more likely to complain of overall fatigue than those who did not.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Variables** & **N** & **Complaint Rate (\%)** & **B** & \(p\)**-Value** & **OR** &
\begin{tabular}{c} **95\% C.I. for OR** \\ **Lower** & **Upper** \\ \hline Shift system & & & & 0.007 * & & \\ Day duty (ref) & 315 & 18.1\% & & & \\ Daily split shifts & 5 & 60.0\% & 1.076 & 0.464 & 2.934 & 0.165 & 52.150 \\ Permanent shifts & 58 & 27.6\% & 0.253 & 0.530 & 1.288 & 0.585 & 2.835 \\ Rotating shifts & 84 & 45.2\% & 1.116 & 0.001 * & 3.052 & 1.620 & 5.747 \\ Vibration & & & & 0.042 * & & \\ <2 h (ref) & 434 & 23.0\% & & & & \\ 2–4 h & 18 & 44.4\% & 0.896 & 0.157 & 2.449 & 0.707 & 8.480 \\ \(\geq\)4 h & 10 & 60.0\% & 1.647 & 0.033 * & 5.191 & 1.139 & 23.649 \\ Infection & & & & 0.056 & & \\ <2 h (ref) & 404 & 21.5\% & & & & \\ 2–4 h & 27 & 33.3\% & 0.755 & 0.157 & 2.128 & 0.747 & 6.065 \\ \(\geq\)4 h & 31 & 58.1\% & 0.999 & 0.038 * & 2.716 & 1.059 & 6.965 \\ Awkward posture & & & & 0.001 * & & & \\ <2 h (ref) & 280 & 13.9\% & & & & \\ 2–4 h & 63 & 30.2\% & 0.801 & 0.040 * & 2.227 & 1.038 & 4.777 \\ \(\geq\)4 h & 119 & 47.1\% & 1.138 & \textless{}0.001 * & 3.120 & 1.723 & 5.649 \\ Repetitive motion & & & & 0.017 * & & & \\ <2 h (ref) & 212 & 13.2\% & & & & \\ 2–4 h & 49 & 32.7\% & 0.902 & 0.047 * & 2.464 & 1.010 & 6.007 \\ \(\geq\)4 h & 201 & 34.8\% & 0.802 & 0.008 * & 2.231 & 1.236 & 4.027 \\ Back pain & & & & 0.002 * & & & \\ No (ref) & 374 & 16.6\% & & & & \\ Yes & 88 & 59.1\% & 1.036 & 0.002 * & 2.818 & 1.459 & 5.442 \\ Upper limb pain & & & & \textless{}0.001 * & & & \\ No (ref) & 342 & 14.3\% & & & & \\ Yes & 120 & 54.2\% & 1.397 & \textless{}0.001 * & 4.044 & 2.179 & 7.503 \\ Constant & & & & \textasci{}-3.381 & \textless{}0.001 * & 0.034 & & \\ \hline \hline \end{tabular}
\end{table}
Table 1: Results of binary logistic regression analysis with overall fatigue.  
Complaining of upper limb pain increased the likelihood of overall fatigue by 4.044 times more than those who did not.