5th Percentile 5th Percentile 10th Percentile 10th Percentile Median Median
Est [95% CI] p-value Est [95% CI] p-value Est [95% CI] p-value
Birth Factors
Sex (male v female) 112 [46.5, 178] 0.0008 63.3 [7.28, 119] 0.03 106 [55.9, 157] <0.0001
Gestational age 275 [193, 358] <0.0001 212 [129, 294] <0.0001 209 [160, 258] <0.0001
Gestational age (non-linear) 0.004 0.003 0.002
Insemination method (ICSI v IVF) -3.36 [-90.4, 83.7] 0.94 -30 [-103, 42.6] 0.42 -8.87 [-73.1, 55.4] 0.79
Delivery (caesarean vs vaginal) -13 [-82.5, 56.5] 0.71 7.09 [-54.5, 68.7] 0.82 80.4 [26, 135] 0.004
Parental Factors
Maternal age -12.3 [-21.4, -3.17] 0.008 -15.2 [-23, -7.34] 0.0001 -7.47 [-14.9, -0.0572] 0.05
Paternal age 6.97 [2.05, 11.9] 0.006 9.5 [4.15, 14.8] 0.0005 2.86 [-1.97, 7.69] 0.25
SEIFA 32.9 [-4.36, 70.1] 0.08 32 [7.92, 56.1] 0.009 44.3 [16.7, 71.8] 0.002
Maternal BMI 37.4 [18.3, 56.6] 0.0001 29.9 [11.9, 47.8] 0.001 15.9 [1.63, 30.1] 0.03
Maternal BMI (non-linear) 0.002 0.03 0.61
Paternal BMI 3.07 [-8.26, 14.4] 0.60 2.43 [-4.91, 9.78] 0.52 7.33 [0.297, 14.4] 0.04
Interaction: Maternal BMI x Paternal BMI 0.0621 [-1.25, 1.38] 0.93 -0.241 [-1.3, 0.82] 0.66 -0.977 [-1.9, -0.0537] 0.04