Correlation of fourteen subjectively reported adverse mental states with insomnia: Gender differences in a cross-sectional study

Table 7 Binary logistic regression analysis of factors influencing severe insomnia in men

Variables	β	SE	Z	P value	Odds ratio	95%CI
Age	0.04	0.01	6.84	< 0.001c	1.04	1.03-1.05
Season
Spring						1.00 (reference)
Summer	0.38	0.28	1.36	0.173	1.47	0.85-2.54
Autumn	0.39	0.24	1.62	0.105	1.48	0.92-2.37
Winter	1.03	0.24	4.29	< 0.001c	2.80	1.75-4.49
Depression	0.54	0.23	2.31	0.021a	1.72	1.08-2.72
Impatience-irritability	0.48	0.18	2.62	0.009b	1.62	1.13-2.32
Indecision	-0.48	0.45	-1.05	0.294	0.62	0.26-1.51
Forgetfulness	0.79	0.19	4.17	< 0.001c	2.20	1.52-3.18
Slow response	0.96	0.19	5.13	< 0.001c	2.60	1.81-3.75

^aP < 0.05.

^bP < 0.01.

^cP < 0.001.

β: Unstandardized regression coefficient; Z: The ratio of the regression coefficient to its standard error.