Table 4.

Results of interaction factors associated with handwashing ^{a, b}

Variables	Handwashing
	Washing frequently				Washing before eating				Washing after toilet				Washing after going out				Washing with soap
	OR	95% CI			OR	95% CI			OR	95% CI			OR	95% CI			OR	95% CI
Year
2013	1.00				1.00				1.00				1.00				1.00
2015	0.82	(0.81	–	0.83)	0.83	(0.81	–	0.84)	0.76	(0.74	–	0.78)	0.63	(0.62	–	0.64)	0.81	(0.80	–	0.82)
2017	0.83	(0.82	–	0.84)	0.81	(0.80	–	0.83)	0.80	(0.78	–	0.82)	0.67	(0.66	–	0.68)	0.80	(0.79	–	0.82)
2019	0.89	(0.87	–	0.90)	0.76	(0.75	–	0.78)	0.79	(0.77	–	0.81)	0.74	(0.73	–	0.76)	0.80	(0.78	–	0.81)
2020	2.18	(2.15	–	2.21)	2.34	(2.28	–	2.40)	2.75	(2.66	–	2.84)	4.95	(4.79	–	5.12)	2.69	(2.63	–	2.74)
Self-perceived health status
Bad	1.00				1.00				1.00				1.00				1.00
Good	1.13	(1.12	–	1.13)	1.20	(1.19	–	1.22)	1.16	(1.15	–	1.17)	1.16	(1.15	–	1.17)	1.10	(1.09	–	1.11)
Year x Self-perceived health status
2013 × Bad	1.00				1.00				1.00				1.00				1.00
2015 × Good	0.98	(0.97	–	0.99)	0.97	(0.96	–	0.99)	0.95	(0.93	–	0.97)	0.95	(0.94	–	0.97)	0.98	(0.97	–	1.00)
2017 × Good	0.99	(0.98	–	1.00)	0.98	(0.96	–	0.99)	0.98	(0.96	–	1.00)	0.97	(0.95	–	0.98)	0.98	(0.97	–	0.99)
2019 × Good	1.00	(0.99	–	1.01)	0.99	(0.97	–	1.01)	0.97	(0.95	–	0.99)	0.98	(0.96	–	1.00)	0.98	(0.97	–	1.00)
2020 × Good	1.01	(1.00	–	1.02)	1.08	(1.06	–	1.10)	1.09	(1.06	–	1.13)	1.11	(1.08	–	1.15)	1.05	(1.03	–	1.07)

^a Reference group: not washing hands always/frequently, not washing hands before eating / after toilet / after outing / with soap; odds ratio (OR); 95% confidence intervals (95% CI)

^b Adjusted for other covariates