Table 1.

Demographic characteristics of study participants (n = 110).

Variable		Number (n)	Percentage (%)
Gender	Male	25	22.7
	Female	85	77.3
Age	<30	47	42.7
	30–34	32	29.1
	35–39	17	15.5
	≥40	14	12.7
Marital status	Unmarried	26	23.6
	Married	81	73.6
	Divorced or widowed	3	2.8
Level of academic qualification	Junior college or below	7	6.4
	Undergraduate	95	86.3
	Master or above	8	7.3
Professional qualification	Primary	63	57.3
	Intermediate or above	47	42.7
Service years	≤5 years	25	22.7
	6–10 years	37	33.7
	11–20 years	26	23.6
	≥21 years	22	20.0
Working hours per day	≤6 h	76	69.1
	7–10 h	28	25.5
	≥11 h	6	5.4
Number of night shifts per week	≤2	40	36.4
	3–4	61	55.5
	≥5	9	8.1