Table 1 Sociodemographic characteristics of research subjects and inter group comparisons

Gender

Male (0)

77 (25.2)

43 (26.4)

26 (25.2)

8 (2.6)

0.285

0.752

Female (1)

228 (74.8)

120 (73.6)

77 (74.8)

31 (97.4)

Age (years)

≤30 (0)

141 (46.2)

84 (51.5)

42 (40.8)

15 (38.5)

3.111

0.046

31–40 (1)

136 (44.6)

66 (40.5)

55 (53.4)

15 (38.5)

>40 (2)

28 (9.2)

13 (8.0)

6 (5.8)

9 (23.0)

Job title

Primary (0)

160 (52.5)

94 (57.7)

45 (43.7)

21 (53.8)

1.539

0.216

Intermediate (1)

138 (45.2)

65 (39.8)

58 (56.3)

15 (38.5)

Senior (2)

7 (2.3)

4 (2.5)

0 (0)

3 (7.7)

Position

Yes (0)

38 (12.5)

20 (12.3)

9 (8.7)

9 (23.1)

2.693

0.069

No (1)

267 (87.5)

143 (87.7)

94 (91.3)

30 (76.9)

Years of work experience

≤5 (0)

100 (32.8)

62 (38.0)

27 (26.2)

11 (28.2)

1.172

0.311

6–10 (1)

80 (26.2)

37 (22.7)

33 (32.1)

10 (25.6)

>10 (2)

125 (41.0)

64 (39.3)

43 (41.7)

18 (46.2)

Marital status

Unmarried (0)

110 (36.1)

69 (42.3)

28 (27.2)

13 (33.3)

3.874

0.022

Married (1)

191 (62.6)

93 (57.1)

72 (69.9)

26 (66.7)

Other (2)

4 (1.3)

1 (0.6)

3 (2.9)

0 (0)

Children

Yes (0)

171 (56.1)

83 (50.9)

64 (62.1)

24 (61.5)

1.888

0.153

No (1)

134 (43.9)

80 (49.1)

39 (37.9)

15 (38.5)

Education level

Vocational (0)

28 (9.2)

17 (10.4)

3 (2.9)

8 (20.5)

6.237

0.002

Undergraduate (1)

269 (88.2)

142 (87.1)

96 (93.2)

31 (79.5)

Postgraduate (2)

8 (2.6)

4 (2.5)

4 (3.9)

0 (0)

Monthly income (RMB)

≤6000 (0)

66 (21.6)

40 (24.5)

12 (11.7)

14 (35.9)

6.810

0.001

6001–8000 (1)

82 (26.9)

49 (30.1)

23 (22.3)

10 (25.6)

8001–10,000 (2)

80 (26.2)

41 (25.2)

35 (34.0)

4 (10.3)

>10,000 (3)

77 (25.2)

33 (20.2)

33 (32.0)

11 (28.2)

Residential situation

Living alone (0)

52 (17.0)

27 (16.6)

21 (20.4)

4 (10.3)

0.675

0.510

Joint tenancy (1)

28 (9.2)

22 (13.5)

2 (1.9)

4 (10.3)

Living with family (2)

225 (73.8)

114 (69.9)

80 (77.7)

31 (79.4)

Sleep status

Normal (0)

141 (46.2)

79 (48.5)

47 (45.6)

15 (38.5)

1.836

0.161

Difficulty falling asleep (1)

73 (23.9)

44 (26.9)

18 (17.5)

11 (28.2)

Early awakening (2)

16 (5.2)

8 (5.0)

6 (5.8)

2 (5.1)

Intermittent sleep (3)

75 (24.6)

32 (19.6)

32 (31.1)

11 (28.2)

Average sleep duration

≤5 h (0)

41 (13.4)

27 (16.6)

10 (9.7)

4 (10.3)

2.308

0.101

6–8 h (1)

252 (82.6)

132 (80.9)

88 (85.4)

32 (82.0)

>8 h (2)

12 (3.9)

4 (2.5)

5 (4.9)

3 (7.7)

Monthly night shift frequency

No (0)

38 (12.5)

19 (11.7)

7 (6.7)

12 (30.8)

6.648

0.001

1–2 times (1)

19 (6.2)

12 (7.4)

5 (4.9)

2 (5.1)

3–5 times (2)

44 (14.4)

30 (18.4)

11 (10.7)

3 (7.7)

>5 times (3)

204 (66.9)

102 (62.5)

80 (77.7)

22 (56.4)

Health

Good (0)

177 (58.0)

94 (57.7)

60 (58.3)

23 (59.0)

0.009

0.991

Moderate (1)

115 (37.7)

62 (38.0)

39 (37.9)

14 (35.9)

Poor (2)

13 (4.3)

7 (4.3)

4 (3.8)

2 (5.1)

Psychological training

Yes (0)

7 (2.3)

3 (1.8)

3 (2.9)

1 (2.6)

0.168

0.846

No (1)

298 (97.7)

160 (98.2)

100 (97.1)

38 (97.4)

Workplace violence

Yes (0)

95 (31.1)

46 (28.2)

40 (38.8)

9 (23.1)

2.350

0.097

No (1)

210 (68.9)

117 (71.8)

63 (61.2)

30 (76.9)

Work-life balance

Yes (0)

266 (87.2)

139 (85.3)

89 (86.4)

38 (97.4)

2.140

0.119

No (1)

39 (12.8)

24 (14.7)

14 (13.6)

1 (2.6)

Hospital grade

Tertiary (0)

283 (92.8)

152 (93.3)

96 (93.2)

35 (89.7)

0.691

0.502

Secondary (1)

22 (7.2)

11 (6.7)

7 (6.8)

4 (10.3)

Support style

Low (0)

16 (5.2)

2 (1.2)

13 (12.6)

1 (2.6)

4.207

0.016

Moderate (1)

124 (40.7)

76 (46.6)

38 (36.9)

10 (25.6)

High (2)

165 (54.1)

85 (52.1)

52 (50.5)

28 (71.8)

Coping style

Positive coping (0)

99 (32.5)

57 (35.0)

18 (17.5)

24 (61.5)

14.107

<0.001

Negative coping (1)

209 (68.5)

106 (65.0)

85 (82.5)

15 (38.5)

Personality traits

Introverted (0)

127 (41.6)

43 (26.4)

77 (74.8)

7 (17.9)

41.787

<0.001

Extroverted (1)

75 (24.6)

36 (22.1)

14 (13.6)

25 (64.2)

Neutral (2)

103 (33.8)

84 (51.5)

12 (11.6)

7 (17.9)