Association between PM2.5 and primary care visits due to asthma attack in Japan: relation to Beijing’s air pollution episode in January 2013

Table 3 Association between air pollutants and primary care visits at night due to asthma attack (single pollutant model)

Air pollutants	Unit increment	Concentration on the day of the PCV			Concentration on the day before the PCV			3-Day mean concentration before the PCV
Air pollutants	Unit increment	OR	95 % CI		OR	95 % CI		OR	95 % CI
PM_2.5	10 μg/m³	1.241	0.938	1.643	0.972	0.725	1.303	1.219	0.744	1.998
PM₁₀	10 μg/m³	1.120	0.953	1.315	1.067	0.881	1.292	1.220	0.915	1.625
OBC	0.1 μg/m³	1.062	0.977	1.153	0.978	0.905	1.057	1.028	0.904	1.168
NO₂	10 ppb	2.083	1.092	3.976	0.829	0.469	1.464	1.267	0.514	3.118
Ozone	10 ppb	0.838	0.512	1.370	1.615*	1.037	2.514	2.603*	1.068	6.344

Associations are shown as the odds ratio (OR) and their 95 % confidence interval (CI) per unit increment of each pollutant. Values have been adjusted for daily mean atmospheric pressure, relative humidity, temperature, wind speed, and hours of daylight
PVC primary care visit
* p < 0.05

ISSN: 1347-4715