Table 2.

Cumulative six days (lag 0–5 days) relative risk and 95% confidence intervals for the ozone metrics associated with outpatient visits of total respiratory diseases (RD), asthma and chronic airway obstruction not elsewhere classified (CAO) using DLNM in Taipei Metropolitan, 2000–2009. Risks were estimated by comparing metrics for ozone concentrations at the 75th (Q3) percentiles with those at the 25th (Q1) percentiles.

	Total RD			Asthma			CAO
	RR	95% CI	AIC	RR	95% CI	AIC	RR	95% CI	AIC
Hot season (May–October)
O3, 1 h max	0.99	0.99–1.00	147,400	1.06	0.93–1.22	7074	0.91	0.85–0.97	11,391
O3, 8 h max	1.03	1.02–1.04	147,209	1.08	0.91–1.28	7072	0.93	0.86–1.01	11,399
O3, 24 h	1.03	1.02–1.04	146,998	1.00	0.84–1.20	7073	0.92	0.85–1.00	11,389
Ox	1.06	1.05–1.07	149,709	1.03	0.87–1.21	7086	0.99	0.91–1.07	11,412
Cold season (November–April)
O3, 1 h max	1.05	1.04–1.06	238,246	1.09	0.94–1.26	7264	0.92	0.85–0.99	12,023
O3, 8 h max	1.04	1.04–1.05	238,292	1.09	0.93–1.28	7262	0.88	0.81–0.96	12,016
O3, 24 h	1.00	1.00–1.01	236,878	0.96	0.81–1.13	7264	0.85	0.78–0.92	12,007
Ox	1.10	1.10–1.11	245,188	1.18	1.00–1.39	7285	0.97	0.89–1.06	12,051
Whole year
O3, 1 h max	1.02	1.01–1.02	396,188	1.02	0.95–1.09	14,386	0.96	0.93–1.00	23,618
O3, 8 h max	1.05	1.04–1.05	395,751	1.03	0.93–1.14	14,384	0.97	0.92–1.02	23,629
O3, 24 h	1.03	1.02–1.03	395,064	1.00	0.90–1.11	14,384	0.94	0.90–0.99	23,625
Ox	1.08	1.08–1.08	405,065	1.08	0.97–1.20	14,397	1.02	0.97–1.08	23,667