Median Median 90th Percentile 90th Percentile 95th Percentile 95th Percentile
Est [95% CI] p-value Est [95% CI] p-value Est [95% CI] p-value
Birth Factors
Sex (male v female) 106 [55.9, 157] <0.0001 142 [77.5, 207] <0.0001 130 [52.5, 208] 0.001
Gestational age 209 [160, 258] <0.0001 175 [112, 237] <0.0001 215 [140, 290] <0.0001
Gestational age (non-linear) 0.002 - 0.16 0.03
Insemination method (ICSI v IVF) -8.87 [-73.1, 55.4] 0.79 -33.2 [-116, 49.2] 0.43 -98.7 [-315, 118] 0.37
Delivery (caesarean vs vaginal) 80.4 [26, 135] 0.004 133 [62.3, 203] 0.0002 157 [80.3, 233] <0.0001
Parental Factors
Maternal age -7.47 [-14.9, -0.0572] 0.05 2.57 [-6.8, 11.9] 0.59 3.57 [-6.14, 13.3] 0.47
Paternal age 2.86 [-1.97, 7.69] 0.25 0.0827 [-6.4, 6.57] 0.98 0.359 [-5.27, 5.99] 0.90
SEIFA 44.3 [16.7, 71.8] 0.002 20.4 [-14, 54.9] 0.25 28.9 [-9.59, 67.4] 0.14
Maternal BMI 15.9 [1.63, 30.1] 0.03 9.48 [-7.99, 26.9] 0.29 25.1 [5.07, 45.1] 0.01
Maternal BMI (non-linear) 0.61 0.32 0.70
Paternal BMI 7.33 [0.297, 14.4] 0.04 3.28 [-6.15, 12.7] 0.50 4.58 [-6.8, 16] 0.43
Interaction: Maternal BMI x Paternal BMI -0.977 [-1.9, -0.0537] 0.04 -0.577 [-1.87, 0.719] 0.38 -0.815 [-2.77, 1.14] 0.41