Table 3.

Comparison of WAI score among different sub-groups.

Index	Groups	WAI scores	t/F-value	P-value
Sex	Male	39.71 ± 6.70	3.494	<0.01
	Female	38.53 ± 6.31
The level of BSL	One	38.18 ± 7.06	2.988	0.051
	Two	38.96 ± 6.30
	Three	37.39 ± 7.20
Age	18 ~ <30	39.38 ± 6.50	11.908	<0.01
	30 ~ 39	38.82 ± 6.07
	40 ~ 49	37.47 ± 6.33
	≥50	35.90 ± 7.12
Education	Vocational or Below	34.62 ± 7.96	18.037	<0.01
	Associate Degree	38.95 ± 6.70
	Bachelor’s Degree	39.16 ± 5.80
	Graduate or Above	39.98 ± 5.16
Working years	≤5	39.54 ± 6.40	13.197	<0.01
	6 ~ 10	39.41 ± 5.90
	11 ~ 20	37.53 ± 6.37
	21 ~ 30	37.37 ± 6.66
	≥31	36.05 ± 7.25
Professional title	Primary	39.16 ± 6.36	11.542	<0.01
	Middle	38.18 ± 6.38
	Senior	36.58 ± 6.73
Marital status	Unmarried	39.34 ± 6.31	2.807	<0.01
	Married	38.50 ± 6.48
Monthly income (In RMB)	≤4,000	38.98 ± 6.51	0.953	0.341
	>4,000	38.70 ± 6.36
Hypertension	Yes	34.24 ± 7.13	−6.421	<0.01
	No	39.02 ± 6.33
Coronary heart disease	Yes	31.17 ± 6.27	−7.208	<0.01
	No	38.97 ± 6.34
Diabetes	Yes	32.96 ± 7.33	−4.526	<0.01
	No	38.90 ± 6.38
Shift assignment	Day shift	39.01 ± 6.30	0.837	0.403
	Night shift	38.75 ± 6.48
	Never	37.18 ± 6.02	21.767	<0.01
Exercise (peer weak)	1 ~ 2 times	39.36 ± 6.37
	3 ~ 4 times	39.89 ± 6.77
	5 times or above	40.52 ± 6.36
Job burnout	Yes	36.78 ± 6.22	25.256	<0.01
	No	43.05 ± 4.49
Sleep quality	Good sleep quality	40.84 ± 5.63	18.284	<0.01
	Sleep disorder	35.66 ± 6.33