Effects of positive psychological control intervention on sleep and psychology of officers and soldiers working at sea

Table 1 General information of submarine officers and soldiers, n (%)

Index	Research group (n = 50)	Control group (n = 71)	t/χ2	P value
Age (years), mean ± SD	26.56 ± 4.00	26.73 ± 3.66	-0.245	0.807
Military age (years)
≤ 3	6 (12.00)	9 (12.68)	0.023	0.999
4-6	17 (34.00)	24 (33.80)
7-9	11 (22.00)	15 (21.13)
≥ 10	16 (32.00)	23 (32.39)
Nationality
Han nationality	48 (96.00)	68 (95.77)	0.004	0.951
Minority	2 (4.00)	3 (4.23)
Education level
Bachelor degree and above	8 (16.00)	12 (16.90)	0.065	0.968
Junior college	24 (48.00)	35 (49.30)
Senior high school and below	18 (36.00)	24 (33.80)
Job classification
Cadre	5 (10.00)	7 (9.86)	0.001	0.980
Warrior	45 (90.00)	64 (90.14)
Marital status (yes/no)	20/30	29/42	0.009	0.926