Table 3.

ORs (95% CI) from conditional logistic regression models for ASD per IQR^e increase in air-pollutant levels in infancy (9 months after birth) mutually adjusted for pre-pregnancy and pregnancy exposures; stratified models

	OR^a (95% CI)
	NO2^e	SO2^e	PM10^e	PM2.5^e
All (N=83,526)	1.08 (1.01, 1.15)	1.21 (1.13, 1.29)	1.04 (1.00, 1.09)	1.06 (1.01, 1.11)

Non-movers (N=74,834)	1.07 (1.00, 1.15)	1.21 (1.13, 1.29)	1.03 (0.98, 1.08)	1.04 (1.00, 1.10)

Males (N=64,414)	1.06 (0.99, 1.14)	1.25 (1.16, 1.35)	1.05 (1.00, 1.10)	1.07 (1.01, 1.13)

Females (N=19,112)	1.12 (0.99, 1.26)	1.11 (0.97, 1.27)	1.01 (0.93, 1.11)	1.02 (0.92, 1.12)

Born 1989–1999 (N=36,190)	1.05 (0.96, 1.14)	1.18 (1.10, 1.27)	1.02 (0.96, 1.08)	1.04 (0.97, 1.11)

Born 2000–2013 (N=47,336)	1.10 (1.01, 1.20)	1.34 (1.15, 1.56)	1.06 (1.00, 1.13)	1.09 (1.02, 1.16)

Copenhagen/large cities^b (N=25,908)	1.12 (1.04, 1.22)	1.36 (1.22, 1.50)	1.06 (1.00, 1.13)	1.09 (1.02, 1.17)

Provincial/rural^c (N=22,772)	1.02 (0.89, 1.15)	1.11 (1.00, 1.23)	1.00 (0.92, 1.08)	1.02 (0.94, 1.11)

Cases from psychiatric hospitals only (N=73,174)	1.09 (1.02, 1.16)	1.23 (1.15, 1.32)	1.06 (1.01, 1.11)	1.08 (1.03, 1.14)

Younger cases only ^d (N=36,472)	1.13 (1.02, 1.24)	1.44 (1.27, 1.62)	1.08 (1.01, 1.16)	1.14 (1.06, 1.23)

adjusted for air pollution levels during pre-pregnancy, pregnancy, and post-pregnancy, as well as all other covariates (maternal age, paternal age, location of birth, neighborhood SES-employment, neighborhood SES-housing, and maternal smoking during pregnancy)

Includes Copenhagen and its suburbs, and large cities i.e. Aarhus, Odense and Aalborg

Includes larger provincial cities/towns and rural areas and small towns (< 10000 inhabitants)

Excludes AD cases with diagnosis age >= 5, Asperger/PDD-NOS cases with diagnosis age >= 10

IQRs in controls: NO2: 11.41 ug/m3; SO2: 2.80 ug/m3; PM10: 3.80 ug/m3; PM2.5: 3.61 ug/m3