Table 1.
Comparison of population characteristics between the total sample and analytical sample
| Continuous variables | Total sample a (n=1536; 472) |
Analytical sample b (n=209; 355) |
p-value c | ||
|---|---|---|---|---|---|
| N | Mean (SD) | n | Mean (SD) | ||
| Grand-maternal BMI (kg/m2) | 1175 | 24.43 (4.20) | 158 | 25.11 (5.05) | 0.21 |
| Maternal birth weight (g) | 1511 | 3393.1 (537.71) | 208 | 3324.3 (527.33) | 0.04 |
| Maternal BMI at age 18 (kg/m2) | 964 | 23.19 (4.33) | 156 | 24.82 (4.91) | <0.0001 |
| Grandchild’s birth weight (g) | 342 | 3371.4 (554.71) | 263 | 3358.8 (573.64) | 0.79 |
| Categorical variables | N | N (%) | n | n (%) | p-value d |
| Grand-maternal SES | 1357 | 192 | 0.03 | ||
| Low | 209 (15.4) | 41 (21.3) | |||
| Medium | 1037 (76.4) | 143 (74.5) | |||
| High | 111 (8.2) | 8 (4.2) | |||
| Grand-maternal SDP | 1521 | 208 | 0.006 | ||
| No | 1137 (74.7) | 137 (65.9) | |||
| Yes | 384 (25.3) | 71 (34.1) | |||
| Maternal SDP | 427 | 325 | 0.85 | ||
| No smoking | 265 (62.1) | 196 (60.3) | |||
| Light smoking | 70 (16.4) | 58 (17.9) | |||
| Moderate smoking | 92 (21.5) | 71 (21.8) | |||
| Grandchild’s gender | 444 | 333 | 0.88 | ||
| Male | 245 (55.2) | 182 (54.7) | |||
| Female | 199 (44.8) | 151 (45.3) | |||
Abbreviation: SD, standard deviation; BMI, body mass index; SES, socioeconomic status; and SDP, smoking during pregnancy.
a
The sample size of the total sample for F0 and F1 generations is 1536, and that for F2 generation is 472.
b
The sample size of the analysis sample for F0 and F1 generations is 209, and that for F2 generation is 355.
c
Two-sample t-test or Wilcoxon rank-sum test.
d
Chi-square test.