Table 4.

Univariate analysis of sociodemographic items related to PCS and MCS scores among the participants

Variable	PCS			MCS
	Mean ± SD	Levene	F/χ2(Z)	Mean ± SD	Levene	F/χ2(Z)
Race		0.28	F = 0.66		0.01	F = 0.86
Han	50.58 ± 9.19			41.31 ± 11.29
Minority	49.58 ± 10.11			42.71 ± 11.44
Age(years)		0.71	F = 2.24		0.01	F = 0.64
17~ 24	50.83 ± 9.47			41.03 ± 11.19
25~ 34	50.21 ± 8.96			41.83 ± 11.52
≥ 35	47.54 ± 8.10			41.82 ± 11.08
Length of service(years)		0.40	F = 3.848**		0.49	F = 0.59
0~ 3	51.26 ± 9.56			41.12 ± 11.15
4~ 8	50.44 ± 8.88			41.97 ± 11.29
9~ 15	49.55 ± 9.06a			40.79 ± 11.53
≥ 16	46.63 ± 8.87ab			41.60 ± 12.41
Marital status		1.42	F = 2.29		0.15	F = 1.40
Unmarried	50.81 ± 9.27			41.50 ± 11.27
Married, but separated	49.17 ± 9.48			41.67 ± 11.15
Married, living together	49.62 ± 8.56			39.42 ± 11.91
Education		0.91	F = 2.39		2.22	F = 0.87
High school diploma or below	50.04 ± 9.41			40.94 ± 11.35
Some college	50.59 ± 9.30			41.89 ± 11.80
Bachelor’s degree or above	51.71 ± 8.62			41.82 ± 10.44
Residential Location		6.62**	Z = −0.91		0.09	F = 0.92
Rural area	50.46 ± 8.90			41.61 ± 11.27
City	50.56 ± 9.83			40.92 ± 11.37
Rank		1.61	F = 8.17**		1.66	F = 2.62*
Soldier	51.76 ± 9.17			41.85 ± 11.34
Sergeant	49.50 ± 9.34a			40.84 ± 11.44
Officer	51.90 ± 8.57b			42.49 ± 10.57b
Household income(yuan/month)		1.59	F = 0.69		0.76	F = 2.92*
< 2000(~  302 US dollar)	50.12 ± 9.64			40.45 ± 11.51
2000 to 4000(~  302 to 605 US dollar)	50.84 ± 8.74			41.82 ± 10.93
> 4000(~  605 US dollar)	50.63 ± 9.50			42.63 ± 11.64a

Note: *p < 0.05, **p < 0.01; The ANOVA test was applied when variance homogeneity was satisfied (F-measure); non parametric rank test was applied when missing variance (Z-measure or Chi square value)

^aMean values were significantly different from those of the first group (p < 0.05)

^bMean values were significantly different from those of the second group (p < 0.05)