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. 2015 Aug 14;5(8):e007034. doi: 10.1136/bmjopen-2014-007034

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ORs for small for gestational age (SGA) by quartiles of the pregnancy average nitrogen oxide (NOx) levels at the home address. aIncludes a random effect for municipality. bAdjusted for maternal asthma, maternal level of education, maternal area of origin, maternal age, first trimester temperature, first trimester ozone, day and year of conception, and parity. cAdditionally adjusted for maternal smoking, body mass index and family situation.