Table 2.

Results of overall risk factors of anxiety depression and insomnia symptoms by multivariate analyses

Scale	Variables	OR	95% CI	p
GAD-7	Area I	1.304	1.012–2.129	0.027*
	Age 50–64 years	2.431	1.823–3.280	0.004**
	Frontline medical staff	2.150	1.346–2.646	0.017*
	Outside activity once in ≥ 30 days	2.719	1.718–3.910	0.003**
PHQ-9	Age 50–64 years	1.936	1.223–3.218	0.023*
	Outside activity once in ≥ 30 days	2.074	1.384–3.023	0.019*
ISI	Area I	1.242	1.038–2.257	0.035*
	Age 50–64 years	2.036	1.162–2.973	0.007**
	Outside activity once in ≥ 30 days	2.225	1.238–4.143	0.003**

The variables showing p < 0.05 in the univariate analysis were entered into the multiple logistic regression model in a backward fashion to adjust for confounding effects of variables included in the multiple logistic regression. The contrast was set as indicator determined by the group with lowest prevalence of anxiety, depression, or insomnia symptoms to explore the risk factors. The multicollinearity diagnostics showed variables that were included in the multivariate analysis did not have significant multicollinearity (variance inflation factor, VIF < 10)

GAD-7 the generalized anxiety disorder-7 scale, PHQ-9 the patient health questionnaire-9, ISI the insomnia severity index, SARS severe acute respiratory syndrome, outbreak in 2003, China

^*p < 0.05 (multivariate logistic regression)

^**p < 0.01 (multivariate logistic regression)