Table 2.

Association between cumulative exposure to fine (diameter ≤ 2.5 μm) particulate matter (PM_2.5) and diagnosis of papillary thyroid cancer (PTC)

Cumulative exposure to PM2.5	PTC diagnosis aOR (95%CI)
	Model 1	Model 2	Model 3
12 months	1.24 (1.05, 1.47)	1.26 (1.06, 1.50)	1.27 (1.07, 1.52)
24 months	1.36 (1.15, 1.60)	1.36 (1.15, 1.60)	1.36 (1.15, 1.61)
36 months	1.43 (1.22, 1.67)	1.42 (1.21, 1.67)	1.42 (1.21, 1.67)

Model 1: Adjusted for age, sex, race, and state of residence

Model 2: Model 1 + BMI, current alcohol use, median household income, current smoking status

Model 3: Model 2 + hypertension, diabetes, COPD, and asthma

aOR Adjusted odds ratio, CI Confidence interval