Table A1.
Distribution of study variables in the NCL analytical and excluded samples due to incomplete data
| Variable | Mean (SD) | |
|---|---|---|
| Analytical sample | Excluded Samplee | |
| Birth weight | 3646.64** (589.76) | 3540.04 (585.64) |
| Smoking | 0.32 (0.47) | 0.32 (0.47) |
| Daily smoking | 0.27 (0.44) | 0.29 (0.45) |
| Cigarettes | 1.83 (3.79) | 2.36 (4.61) |
| Binge drinking in the first trimestera | 0.05 (0.21) | 0.06 (0.23) |
| Moderate drinking in the first trimestera | 0.09 (0.29) | 0.09 (0.28) |
| Low drinking in the first trimestera | 0.18 (0.39) | 0.14 (0.34) |
| Binge drinking before pregnancya | 0.38 (0.49) | 0.4 (0.49) |
| Moderate drinking before pregnancya | 0.4 (0.49) | 0.41 (0.49) |
| Low drinking before pregnancya | 0.13* (0.34) | 0.09 (0.29) |
| Multivitamin use | 0.38 (0.49) | 0.34 (0.47) |
| Underweightb | 0.03 (0.17) | 0.05 (0.22) |
| Overweightb | 0.19 (0.39) | 0.18 (0.38) |
| Obeseb | 0.07 (0.25) | 0.08 (0.26) |
| Calories | 2281.19 (751.15) | 2300.01 (928.38) |
| Maternal age | 29.43 (4.7) | 28.84 (4.91) |
| Married | 0.53 (0.5) | 0.53 (0.5) |
| Less than high schoolc | 0.09*** (0.28) | 0.17 (0.37) |
| High schoolc | 0.27 (0.44) | 0.3 (0.46) |
| Technical collegec | 0.2 (0.4) | 0.21 (0.41) |
| Universityc | 0.07 (0.26) | 0.04 (0.2) |
| Maternal employment | 0.86 (0.35) | 0.83 (0.37) |
| Very low maternal incomed | 0.34* (0.47) | 0.41 (0.49) |
| Moderate maternal incomed | 0.25 (0.43) | 0.2 (0.4) |
| High maternal incomed | 0.15 (0.35) | 0.13 (0.34) |
| Pregnancy planning | 0.74 (0.44) | 0.71 (0.45) |
| rs1041983_ C/T | 0.43 (0.5) | 0.45 (0.5) |
| rs1041983_ C/C | 0.49 (0.5) | 0.36 (0.49) |
| rs1930139_ A/G | 0.32 (0.47) | 0.26 (0.44) |
| rs1930139_ G/G | 0.05 (0.21) | 0.11 (0.31) |
| rs721398_C/T | 0.39 (0.49) | 0.49 (0.51) |
| rs721398_C/C | 0.07 (0.26) | 0.07 (0.26) |
| rs5758589_A/G | 0.49 (0.5) | 0.5 (0.51) |
| rs5758589_G/G | 0.25 (0.44) | 0.24 (0.43) |
| rs1432007_A/G | 0.52 (0.5) | 0.56 (0.5) |
| rs1432007_G/G | 0.26 (0.44) | 0.24 (0.43) |
| rs2059574_A/T | 0.47 (0.5) | 0.52 (0.51) |
| rs2059574_T/T | 0.34 (0.47) | 0.36 (0.49) |
| rs2268973_A/G | 0.4 (0.49) | 0.36 (0.48) |
| rs2268973_G/G | 0.52 (0.5) | 0.48 (0.51) |
The reference category is no drinking.
The reference category is normal weight (18.5≤BMI<25).
The reference category is 2–4 years of college.
The reference category is 151,000–200,000 kr.
The distribution in the excluded sample for a certain variable is based on the observations that had data for that variable (these observations did not have complete data on all study variables). In the Norway sample, About 250 observations had data on non-genetic variables except for calories (about 200 observations). About 40–45 observations had data on the genetic instruments.
indicate significant differences between the analytical and excluded
samples at p<0.1, 0.05 and 0.01 respectively.