Table 4. Results of the logistic regression analysis for having travelled within the past 7 days for Shenzhen.

		N	% travelled	OR (95% CI)	p
registration	not reg	9789	2.53
	reg	2091	6.79	2.5 (1.9–3.3)	<5e-4
distance to work/school	<10 km	10962	2.98
	> = 10 km	918	6.86	1.9 (1.4–2.6)	<5e-4
subpopulation	local	9886	3.64
	migrant	1994	1.50	0.47 (0.31–0.71)	<5e-4
family size	< = 3	6801	3.44
	>3	5079	3.07	0.68 (0.51–0.91)	0.011