Table 2.
Linear models regressing cognitive ability (standardized) on mode of conception and birthweight status
| Age 3 | Age 5 | Age 7 | Age 11 | Age 14 | |
|---|---|---|---|---|---|
| BAS | BAS | BAS | BAS | BAS | |
| naming vocabulary | naming vocabulary | word reading | verbal similarity | word activity | |
| β (95% CI) | β (95% CI) | β (95% CI) | β (95% CI) | β (95% CI) | |
| Panel A: Baseline modelsa | |||||
| NC NLBW | Reference | Reference | Reference | Reference | Reference |
| NC LBW |
-0.272 (-0.348, -0.196) |
-0.216 (-0.306, -0.127) |
-0.218 (-0.303, -0.133) |
-0.121 (-0.210, -0.032) |
-0.105 (-0.208, -0.001) |
| MAR NLBW |
0.181 (0.052, 0.311) |
0.324 (0.211, 0.437) |
0.345 (0.232, 0.457) |
0.228 (0.093, 0.358) |
0.226 (0.068, 0.384) |
| MAR LBW |
0.021 (-0.198, 0.241) |
0.213 (0.009, 0.418) |
0.163 (-0.148, 0.474) |
0.003 (-0.318, 0.325) |
0.156 (-0.205, 0.517) |
| Panel B: Adjusted modelsb | |||||
| NC NLBW | Reference | Reference | Reference | Reference | Reference |
| NC LBW |
-0.200 (-0.267, -0.132) |
-0.118 (-0.196, -0.040) |
-0.182 (-0.266, -0.097) |
-0.093 (-0.179, -0.008) |
-0.062 (-0.161, 0.051) |
| MAR NLBW |
-0.067 (-0.192, -0.058) |
0.046 (-0.060, 0.153) |
0.115 (0.004, 0.226) |
0.002 (-0.130, 0.126) |
-0.028 (-0.180, 0.123) |
| MAR LBW |
-0.198 (-0.401, 0.005) |
0.017 (-0.159, 0.193) |
-0.074 (-0,369, 0.220) |
-0.162 (-0.472, 0.148) |
-0.023 (-0.386, 0.339) |
| N | 13716 | 14175 | 12714 | 12336 | 10220 |
NC NLBW, naturally conceived born non-low birthweight; NC LBW, naturally conceived born low birthweight; MAR NLBW, conceived with medically assisted reproduction and born non-low birthweight; MAR LBW: conceived with medically assisted reproduction and born low birthweight.
Baseline models include: sex, multiple birth.
Adjusted models include: sex, multiple birth, maternal education, whether the child is firstborn, maternal age at the time of birth, maternal marital status at the time of birth, timing of the first prenatal visit, ethnic origin, whether the mother smoked during pregnancy.