Male7,22056.847.956.847.441.3 χ 2 = 217.6, p < 0.001 Female6,75643.252.143.252.658.7Housing tenure Mortgaged/owned9,55961.273.780.083.188.2 χ 2 = 868.4, p < 0.001 Private rented1,38413.711.68.48.26.7 Subsidized rented2,08225.114.711.78.75.2Parity First born5,77041.741.643.249.050.8 χ 2 = 124.7, p < 0.001 Second born4,53934.736.437.134.634.2 Third born plus2,61823.622.019.816.415.0Maternal education A level or higher4,39224.732.634.142.853.3 χ 2 = 900.1, p < 0.001 O-level4,29634.034.238.236.332.4 <O-level3,72841.333.327.720.914.3Household income Top 20 %1,99215.117.618.622.727.6 χ 2 = 366.2, p < 0.001 Middle 60 %5,93756.160.061.862.361.4 Lowest 20 %2,01028.822.419.615.111.0Social class Professional/managerial and tech.6,33946.652.255.359.269.0 χ 2 = 334.6, p < 0.001 Skilled non-manual or lower5,16253.447.844.740.831.0Maternal age at delivery <25 years3,33733.821.918.714.811.6 χ 2 = 807.5, p < 0.001 25–295,40337.440.542.240.436.7 30–343,85021.327.629.633.237.0 35+1,3867.510.19.411.714.7
