Table 3. Relationships between the annual average numbers of antibiotic prescription days and the place of residence as analyzed by multiple logistic regression.

Days of prescription		OR (95% CI)
		0	1–15	16–30	31–60	61–90	> 90
Total
	Rural	1.000	1.283 (1.270–1.295)	1.968 (1.946–1.990)	2.535 (2.504–2.567)	3.420 (3.356–3.485)	4.772 (4.661–4.886)
	Urban	0.916 (0.905–0.928)	1.341 (1.328–1.355)	2.1 (2.075–2.125)	2.839 (2.800–2.878)	4.115 (4.020–4.213)	5.785 (5.609–5.966)
Atopic dermatitis
	Rural	1.000	1.146 (1.109–1.185)	1.535 (1.481–1.590)	2.536 (2.449–2.626)	4.719 (4.531–4.914)	9.513 (9.123–9.919)
	Urban	1.018 (0.978–1.060)	1.248 (1.207–1.291)	1.766 (1.703–1.832)	3.047 (2.938–3.160)	5.971 (5.707–6.246)	12.031 (11.460–12.630)
Asthma
	Rural	1.000	2.491 (2.443–2.540)	4.582 (4.491–4.675)	6.816 (6.678–6.957)	9.518 (9.276–9.766)	12.157 (11.800–12.525)
	Urban	0.938 (0.915–0.962)	2.429 (2.382–2.478)	4.826 (4.727–4.927)	7.754 (7.588–7.924)	11.659 (11.315–12.013)	14.635 (14.105–15.185)
Allergic rhinitis
	Rural	1.000	1.162 (1.150–1.174)	1.631 (1.612–1.651)	1.826 (1.802–1.851)	2.255 (2.210–2.301)	3.213 (3.135–3.294)
	Urban	0.907 (0.895–0.919)	1.217 (1.204–1.230)	1.731 (1.710–1.753)	2.016 (1.986–2.046)	2.659 (2.593–2.726)	3.894 (3.771–4.021)

The values are multivariate-adjusted ORs (with 95% CIs).

OR, odds ratio; CI, confidence interval.