Sociodemographic Characteristic | Analytic Group | Excluded Group | P value | ||
---|---|---|---|---|---|
Observed(n = 953) | Observed(n = 23) |  | |||
Mean ± SD / % | N | Mean ± SD / % | N |  | |
Children gender | Â | Â | Â | Â | 0.642 |
 Male | 492 (51.6) | 953 | 13 (56.5) | 23 |  |
 Female | 461 (48.4) | 10 (43.5) |  | ||
Family member number | 4.31 (0.95) | 953 | 4.0 (0.8) | 23 | 0.166 |
Pregnant weight (kg) | 68.38 (9.11) | 953 | 69.6 (10.4) | 23 | 0.525 |
Physical activity in pregnant period (minutes/day) | 46.69 (25.94) | 953 | 47.2 (22.2) | 23 | 0.93 |
Pregnancy exercise (yes) | 820 (86.9) | 944 | 18 (81.8) | 22 | 0.49 |
Pregnancy exercise intensity | Â | Â | Â | Â | 0.791 |
 Low intensity exercise | 810 (99.6) | 813 | 19 (100) | 19 |  |
 Moderate exercise | 3 (0.4) | 0 (0) |  | ||
Mother physical activity behavior | 275 (29.8) | 923 | 7 (58.3) | 12 | 0.032 |
Mother physical activity | Â | 278 | Â | 7 | 0.651 |
 Low intensity exercise | 224 (80.6) |  | 5 (71.4) |  |  |
 Moderate exercise | 46 (16.5) |  | 2 (28.6) |  |  |
Heavy exercise | 8 (2.9) | Â | 0 (0) | Â | Â |
Pregnancy computer use | 318 (80.7) | 383 | 0 (0) | 5 | 0.551 |
Pregnancy phone use | 323 (96.7) | 334 | 4 (100) | 4 | 0.712 |
Maternal race (Han) | 921 (96.6) | 944 | 23 (100) | 23 | 0.671 |
Maternal age (years) | 29.92 (3.92) | 953 | 30.6 (4.7) | 23 | 0.398 |
Educational level | Â | 942 | Â | 22 | 0.721 |
 Less than primary school | 2 (0.2) |  | 0 (0) |  |  |
 Middle school | 31 (3.3) |  | 0 (0) |  |  |
 High school | 114 (12.1) |  | 4 (18.2) |  |  |
 University | 722 (76.6) |  | 15 (68.2) |  |  |
 Graduate school | 69 (7.3) |  | 3 (13.6) |  |  |
 Other education | 4 (0.4) |  | 0 (0) |  |  |
Maternal occupation | Â | 940 | Â | 22 | 0.787 |
 1 | 35 (3.7) |  | 0 (0) |  |  |
 2 | 178 (18.7) |  | 6 (26.1) |  |  |
 3 | 365 (38.3) |  | 8 (34.8) |  |  |
 4 | 2 (0.2) |  | 0 (0) |  |  |
 5 | 5 (0.5) |  | 0 (0) |  |  |
 6 | 355 (37.3) |  | 8 (34.8) |  |  |
Paternal race (Han) | 920 (96.5) | 943 | 23 (100) | 23 | 0.364 |
Paternal age (years) | 32.06 (4.85) | 953 | 33.0 (6.9) | 23 | 0.384 |
Educational level | Â | 941 | Â | 23 | 0.725 |
 Less than primary school | 4 (0.4) |  | 0 (0) |  |  |
 Middle school | 25 (2.7) |  | 1 (4.3) |  |  |
 High school | 109 (11.6) |  | 2 (8.7) |  |  |
 University | 690 (73.3) |  | 15 (65.2) |  |  |
 Graduate school | 108 (11.5) |  | 5 (21.7) |  |  |
 Other education | 5 (0.5) |  | 0 (0) |  |  |
Paternal occupation | Â | 933 | Â | 23 | 0.658 |
 1 | 55 (5.8) |  | 1 (4.3) |  |  |
 2 | 240 (25.2) |  | 3 (13) |  |  |
 3 | 303 (31.8) |  | 7 (30.4) |  |  |
 4 | 3 (0.3) |  | 0 (0) |  |  |
 5 | 42 (4.4) |  | 2 (8.7) |  |  |
 6 | 290 (30.4) |  | 10 (43.5) |  |  |
Infant weight (kg) | 3.33 (0.46) | 953 | 3.37 (0.57) | 23 | 0.686 |
Household income (yuan/month) | Â | Â | Â | Â | Â |
 Less than 2000 yuan/month | 31 (3.4) | 922 | 0 (0) | 23 | 0.259 |
 2001–5000 yuan/month | 493 (53.5) | 9 (39.1) |  | ||
 5001–10,000 yuan/month | 360 (39.0) | 14 (60.9) |  | ||
 10,001–15,000 yuan/month | 28 (3.0) | 0 (0) |  | ||
 More than 15,000 yuan/month | 10 (1.1) | 0 (0) |  | ||
Pregnancy depression | 29 (3.0) | 953 | 0 (0) | 23 | 0.396 |