Table 4 Descriptive statistics of the raw scores on triplet BW and GA, and percentage of smoking and alcohol consumption during pregnancy, as a function of zygosity
| Â | MZ | DZ | TZ | |
|---|---|---|---|---|
N trios | 37 | 102 | 271 | |
N boys/girls | 41/70 | 145/161 | 387/426 | |
GA mean (sd) | 33.3 (2.15) | 33.6 (2.89) | 33.7 (2.52) | |
N mothers consuming alcohol | 3 (8%) | 19 (19%) | 36 (13%) | |
N mothers smoking | 6 (16%) | 19 (19%) | 49 (18%) | |
| Â | MZ | MZ* | DZ** | TZ |
Mean BW first born (grams) | 1852 | 1952 | 2017 | 1954 |
Mean BW second born (grams) | 1759 | 1887 | 1941 | 1933 |
Mean BW third born (grams) | 1789 | 1831 | 2107 | 1829 |
Variance triplet BW | 157 | 230 | 262 | 215 |
Pair-wise covariance triplet BW | 110 | 162 | 156 | 144 |
Pair-wise correlation triplet BW | 0.70 | 0.70 | 0.64 | 0.67 |
SGA first born (% SE ss/US ss/US ts) | 19/42/3 | 22/38/5 | 27/37/7 | 25/44/7 |
SGA sec. born (% SE ss/US ss/US ts ) | 41/57/14 | 41/24/5 | 14/59/13 | 25/41/9 |
SGA third born (% SE ss/US ss/US ts) | 32/51/16 | 35/39/8 | 18/33/11 | 18/52/15 |