Table 3. Effect of Prenatal PM_2.5 Exposure on Otitis Media and Lower Respiratory Infections between Years with Extreme Wildfire Seasons in 2017 and 2018 and Below-Average Wildfire Seasons in 2016 and 2019.

	extreme seasons (2017 and 2018)	below-average seasons (2016 and 2019)	p-value
Otitis Media
Developmental Windows
window 1 (0–9 weeks)	1.76 [1.62, 1.90]	0.56 [0.50, 0.63]	p < 0.001
window 2 (10–12 weeks)	1.78 [1.65, 1.93]	0.56 [0.50, 0.61]	p < 0.001
window 3 (13–18 weeks)	1.75 [1.61, 1.89]	0.64 [0.57, 0.71]	p < 0.001
window 4 (19–28 weeks)	1.75 [1.62, 1.90]	0.65 [0.57, 0.74]	p < 0.001
window 5 (>28 weeks)	1.82 [1.68, 1.98]	0.57 [0.50, 0.65]	p < 0.001
Trimesters
trimester 1 (0–13 weeks)	1.78 [1.64, 1.93]	0.54 [0.47, 0.62]	p < 0.001
trimester 2 (14–27 weeks)	1.72 [1.58, 1.86]	0.72 [0.63, 0.83]	p < 0.001
trimester 3 (>27 weeks)	1.83 [1.68, 1.98]	0.57 [0.50, 0.65]	P = 0.005
Lower respiratory infection
Developmental Windows
embryonic stage (0–7 weeks)	1.33 [1.26, 1.41]	0.81 [0.74, 0.88]	p < 0.001
pseudoglandular stage (8–17 weeks)	1.37 [1.29, 1.46]	0.76 [0.69, 0.84]	p < 0.001
canalicular stage (18–27 weeks)	1.36 [1.28, 1.45]	0.81 [0.73, 0.89]	p < 0.001
saccular stage (28–36 weeks)	1.44 [1.35, 1.53]	0.68 [0.62, 0.75]	p < 0.001
alveolar stage (>37 weeks)	1.41 [1.33, 1.50]	0.70 [0.65, 0.75]	p < 0.001
Trimesters
trimester 1 (0–13 weeks)	1.36 [1.28, 1.44]	0.79 [0.71, 0.88]	p < 0.001
trimester 2 (14–27 weeks)	1.35 [1.27, 1.44]	0.84 [0.75, 0.94]	p < 0.001
trimester 3 (>27 weeks)	1.45 [1.36, 1.55]	0.66 [0.60, 0.74]	p < 0.001