Table 2. Mean happiness score by sociodemographic characteristics, subjective health, and contact frequency.

Variable	Category	Mean	SE	p-value	95% CI
Sex	Male	7.04	0.01	< .001	0.05–0.09*
	Female	6.97	0.01		NA
Age group, years	19–29	7.02	0.01	< .001	0.23–0.30*
	30–39	7.21	0.01		0.43–0.49*
	40–59	7.08	0.01		0.30–0.35*
	≥60	6.75	0.01		NA
Education level	No or primary education	6.45	0.01	< .001	NA
	Middle school	6.67	0.02		0.18–0.26*
	High school	6.93	0.01		0.45–0.50*
	College or higher	7.30	0.01		0.81–0.87*
Marital status	Currently married	7.18	0.01	< .001	0.32–0.37*
	Ever-married	6.40	0.01		-0.47 –-0.40*
	Never-married	6.84	0.01		NA
Live alone	No	7.06	0.01	< .001	0.53–0.60*
	Yes	6.50	0.01		NA
Employment status	Self-employed	7.09	0.01	< .001	0.24–0.30*
	Salaried	7.12	0.01		0.28–0.32*
	Economically inactive	6.82	0.01		NA
Subjective health status	Very healthy	7.92	0.02	< .001	2.59–2.76*
	Healthy	7.48	0.01		2.16–2.31*
	Neutral	6.87	0.01		1.56–1.70*
	Unhealthy	6.16	0.01		0.84–0.99*
	Very unhealthy	5.24	0.03		NA
Contact frequency with relative/family	<1/month	6.59	0.01	< .001	NA
	1/month	6.96	0.01		0.33–0.41*
	2–3/month	7.06	0.01		0.44–0.51*
	1/week	7.09	0.01		0.47–0.55*
	2–3/week	7.11	0.01		0.48–0.55*
	≥4/week	7.19	0.01		0.57–0.64*
Contact frequency with neighbor	<1/month	6.88	0.01	< .001	NA
	1/month	7.09	0.02		0.17–0.25*
	2–3/month	7.09	0.02		0.18–0.25*
	1/week	7.12	0.02		0.20–0.28*
	2–3/week	7.12	0.01		0.21–0.27*
	≥4/week	7.12	0.01		0.21–0.27*
Contact frequency with friend	<1/month	6.53	0.01	< .001	NA
	1/month	6.94	0.01		0.37–0.45*
	2–3/month	7.06	0.01		0.49–0.56*
	1/week	7.10	0.01		0.53–0.60*
	2–3/week	7.12	0.01		0.55–0.62*
	≥4/week	7.18	0.01		0.61–0.68*

Abbreviations: CI, confidence intervals; NA, not available

*Post-hoc analysis was significant at the 0.001 level.