Variable | Â | N (%) | SAS | t/F Value | P | SDS | t/F Value | P |
---|---|---|---|---|---|---|---|---|
Maternal age (year) |  |  |  | 3.04 | 0.03 |  | 1.96 | 0.12 |
 | < 25 | 14(6.67) | 50.63 ± 5.34 |  |  | 54.20 ± 10.89 |  |  |
 | 25~29 | 64(30.48) | 46.99 ± 5.51 |  |  | 51.04 ± 9.23 |  |  |
 | 30~34 | 93(44.28) | 47.30 ± 6.98 |  |  | 50.08 ± 9.33 |  |  |
 | ≥ 35 | 39(18.57) | 44.81 ± 6.89 |  |  | 47.76 ± 8.32 |  |  |
Pre-gravid Body Mass Index (kg/m 2 ) | Â | Â | Â | 0.44 | 0.65 | Â | 0.46 | 0.63 |
 | < 18.5 | 15(7.14) | 45.50 ± 6.92 |  |  | 48.50 ± 12.25 |  |  |
 | 18.5~24 | 123(58.57) | 47.17 ± 6.26 |  |  | 50.66 ± 8.98 |  |  |
 | ≥ 24.0 | 72(34.29) | 46.91 ± 6.70 |  |  | 49.81 ± 9.22 |  |  |
Education | Â | Â | Â | 2.02 | 0.05 | Â | 1.92 | 0.06 |
 | ≤Senior high school | 58(27.62) | 48.43 ± 6.76 |  |  | 52.20 ± 9.34 |  |  |
 | >Senior high school | 152(72.38) | 46.41 ± 6.40 |  |  | 49.46 ± 9.20 |  |  |
Monthly per capita household income (yuan) |  |  |  | 2.07 | 0.13 |  | 2.44 | 0.09 |
 | < 4000 | 25(11.90) | 48.95 ± 5.84 |  |  | 53.50 ± 7.28 |  |  |
 | 4000~8000 | 97(46.20) | 47.26 ± 6.63 |  |  | 50.50 ± 9.53 |  |  |
 | > 8000 | 88(41.90) | 46.08 ± 6.55 |  |  | 48.96 ± 9.30 |  |  |
Previous health status | Â | Â | Â | -6.21 | 0.00 | Â | -4.69 | 0.00 |
 | Good | 158(75.4) | 45.48 ± 5.75 |  |  | 48.57 ± 8.80 |  |  |
 | Worse | 52(24.76) | 51.47 ± 6.80 |  |  | 55.22 ± 9.05 |  |  |
Depression history | Â | Â | Â | 4.33 | 0.00 | Â | 2.64 | 0.01 |
 | Yes | 8(3.81) | 56.41 ± 8.88 |  |  | 58.59 ± 11.72 |  |  |
 | No | 202(96.19) | 46.59 ± 6.17 |  |  | 49.88 ± 9.06 |  |  |
Gestation age (week) |  |  |  | 1.60 | 0.11 |  | 1.06 | 0.29 |
 | < 28 | 73(34.76) | 45.98 ± 6.91 |  |  | 49.28 ± 9.94 |  |  |
 | ≥ 28 | 137(65.24) | 47.49 ± 6.30 |  |  | 50.71 ± 8.93 |  |  |
Parity | Â | Â | Â | 0.96 | 0.34 | Â | 1.30 | 0.20 |
 | Primiparous | 164(78.10) | 47.20 ± 6.50 |  |  | 50.66 ± 9.48 |  |  |
 | Multiparous | 46(21.90) | 46.14 ± 6.72 |  |  | 48.64 ± 8.51 |  |  |
Mode of conception | Â | Â | Â | -1.24 | 0.22 | Â | -1.71 | 0.09 |
 | Spontaneous conceived | 73(34.76) | 46.20 ± 5.84 |  |  | 48.72 ± 8.90 |  |  |
 | Assisted reproduction | 137(65.24) | 47.37 ± 6.88 |  |  | 51.01 ± 9.44 |  |  |
Planned pregnancy | Â | Â | Â | -1.31 | 0.19 | Â | -1.31 | 0.19 |
 | Yes | 188(89.52) | 46.76 ± 6.53 |  |  | 49.93 ± 9.13 |  |  |
 | No | 22(10.48) | 48.69 ± 6.53 |  |  | 52.67 ± 10.52 |  |  |
Type of pregnancy | Â | Â | Â | 0.52 | 0.60 | Â | 0.65 | 0.52 |
 | Dichorionic diamniotic | 169(80.48) | 46.75 ± 6.68 |  |  | 50.05 ± 9.44 |  |  |
 | Monochorionic diamniotic | 31(14.76) | 47.62 ± 6.49 |  |  | 50.04 ± 9.26 |  |  |
 | Monochorionic monoamniotic | 10(4.76) | 48.50 ± 3.94 |  |  | 53.50 ± 6.61 |  |  |
Negative life events | Â | Â | Â | 2.81 | 0.01 | Â | 4.10 | 0.00 |
 | Yes | 29(13.81) | 50.09 ± 5.94 |  |  | 56.55 ± 9.17 |  |  |
 | No | 181(86.19) | 46.46 ± 6.51 |  |  | 49.20 ± 8.93 |  |  |
Sleep disturbance | Â | Â | Â | 4.55 | 0.00 | Â | 3.27 | 0.00 |
 | At least one | 59(28.10) | 50.10 ± 6.99 |  |  | 53.50 ± 9.35 |  |  |
 | None | 151(71.90) | 45.74 ± 5.95 |  |  | 48.93 ± 8.98 |  |  |
Physical activity regularly | Â | Â | Â | -2.62 | 0.01 | Â | -3.58 | 0.00 |
 | Yes | 89(42.38) | 45.60 ± 6.15 |  |  | 47.61 ± 8.90 |  |  |
 | No | 121(57.62) | 47.96 ± 6.67 |  |  | 52.13 ± 9.15 |  |  |