Table 2.

Associations of multiple predictor variables and fatigue^∗

Variable (category)	Odds ratio	95% confidence interval		p†
Stress (high)	2.75	1.62	4.68	0.000
Sleep time before work (≥6 hours)	0.39	0.23	0.67	0.001
Country of origin (South Africa)	2.52	1.14	5.52	0.021
Sleep problems (yes)	2.05	1.16	3.62	0.013
Salary (>R7500)	0.50	0.28	0.89	0.018
Health (good)	0.58	0.30	1.13	0.112
Age (≥40 years)	0.56	0.32	0.99	0.045
Exercise (yes)	0.60	0.35	1.02	0.061
Province of origin (same as mine province)	1.59	0.89	2.84	0.117
Work area (underground)	1.67	0.79	3.52	0.182

CI, confidence interval.

^∗Results of stepwise logistic regression.

^†Italics values indicate significance (p < 0.05).