Fig. 2
From: Effect of PM2.5 exposure on susceptibility to allergic asthma in elderly rats treated with allergens
Effects of PM2.5 exposure on AHR and lung function in elderly rats. (A) Penh values, (B) respiration rates, (C) tidal volume. 8 (a) represents before excitation on week 8, and 8 (b) represents after excitation on week 8. The data are presented as the mean ± SD (n = 4). *P < 0.05, **P < 0.01, ***P < 0.001 vs. Sa group. #P < 0.05, ##P < 0.01, ###P < 0.001 vs. As group. &P < 0.05 vs. PO group.
