Table 4.
Characteristics between the included and the total participants
| Characteristics | N(%) or mean(SD) | χ 2 /F | P | |
|---|---|---|---|---|
| Total participants | 2361 sample | |||
| Monthly income | 0.379 | 0.827 | ||
| < 360.5 | 866(26.5) | 623(26.4) | ||
| 360.5–576.8 | 1400(42.9) | 997(42.2) | ||
| > 576.8 | 1001(30.6) | 741(31.4) | ||
| Residence | 4.520 | 0.210 | ||
| city proper | 2548(78.0) | 1893(80.2) | ||
| suburbs | 386(11.8) | 255(10.8) | ||
| county town | 56(1.7) | 41(1.7) | ||
| countryside | 277(8.5) | 172(7.3) | ||
| Infant gender | 0.048 | 0.826 | ||
| boy | 1666(51.0) | 1211(51.3) | ||
| girl | 1601(49.0) | 1150(48.7) | ||
| Birth term | 0.769 | 0.381 | ||
| preterm | 134(4.1) | 86(3.6) | ||
| in time | 3133(95.9) | 2275(96.4) | ||
| Maternal grandfather age | 54.35(5.887) | 54.48(5.891) | 0.000 | 0.999 |
| Total participants | 2626 sample | |||
| Monthly income | 0.290 | 0.865 | ||
| < 360.5 | 866(26.5) | 705(26.8) | ||
| 360.5–576.8 | 1400(42.9) | 1107(42.2) | ||
| > 576.8 | 1001(30.6) | 814 (31.0) | ||
| Residence | 3.266 | 0.352 | ||
| city proper | 2548(78.0) | 2096(79.8) | ||
| suburbs | 386(11.8) | 283(10.8) | ||
| county town | 56(1.7) | 37(1.4) | ||
| countryside | 277(8.5) | 210(8.0) | ||
| Infant gender | 0.100 | 0.752 | ||
| boy | 1666(51.0) | 1350(51.4) | ||
| girl | 1601(49.0) | 1276(48.6) | ||
| Birth term | 0.003 | 0.959 | ||
| preterm | 134(4.1) | 107(4.1) | ||
| in time | 3133(95.9) | 2519(95.9) | ||
| Maternal grandfather age | 54.35(5.887) | 54.45(5.905) | 0.002 | 0.967 |