Table 1 Baseline characteristics of included pregnant women
|  | Non-depressive group (N = 700, 70.28%) | Second trimester depressive group (N = 93, 9.34%) | Third trimester depressive group (N = 96, 9.64%) | persistent depressive group (N = 107, 10.72%) | Overall number (N = 996) |
|---|---|---|---|---|---|
Demographic data and social satus | |||||
 Maternal age (Mean ± SD) | 29.20 ± 3.80 | 28.32 ± 3.59 | 28.15 ± 3.67 | 28.40 ± 3.50 | 28.93 ± 3.76 |
 Educational level | |||||
  Primary school | 5 (0.71) | 0 (0.00) | 2 (2.08) | 2 (1.87) | 9 (0.90) |
  Secondary school | 124 (17.71) | 16 (17.20) | 18 (18.75) | 26 (24.30) | 184 (18.47) |
  Bachelor and above | 540 (77.14) | 69 (74.19) | 70 (72.92) | 70 (65.42) | 749 (75.20) |
  Unknown | 31 (4.43) | 8 (8.60) | 6 (6.25) | 9 (8.41) | 54 (5.42) |
 Employmenta | |||||
  Part-time job | 24 (3.43) | 4 (4.30) | 4 (4.17) | 1 (0.93) | 33 (3.31) |
  Full time job | 546 (78.00) | 72 (77.42) | 75 (78.13) | 76 (71.03) | 769 (77.21) |
  Unemployed | 130 (18.57) | 17 (18.28) | 17 (17.71) | 30 (28.04) | 194 (19.48) |
 Years of living in Chengdu | |||||
  < 5 years | 183 (26.14) | 28 (30.11) | 27 (28.13) | 32 (29.91) | 270 (27.11) |
  6–10 years | 196 (28.00) | 27 (29.03) | 33 (34.38) | 33 (30.84) | 289 (29.02) |
  11–20 years | 105 (15.00) | 13 (13.98) | 6 (6.25) | 14 (13.08) | 138 (13.86) |
  > 20 years | 216 (30.86) | 25 (26.88) | 30 (31.25) | 28 (26.17) | 299 (30.02) |
 Family income per capita (Yuan) | |||||
  < 1200 | 21 (3.00) | 3 (3.23) | 2 (2.08) | 3 (2.80) | 29 (2.91) |
  1200–2000 | 69 (9.86) | 6 (6.45) | 12 (12.50) | 13 (12.15) | 100 (10.04) |
  2001–3000 | 101 (14.43) | 15 (16.13) | 20 (20.83) | 20 (18.69) | 156 (15.66) |
  3001–4000 | 141 (20.14) | 19 (20.43) | 15 (15.63) | 19 (17.76) | 194 (19.48) |
  > 4000 | 368 (52.57) | 50 (53.76) | 47 (48.96) | 52 (48.60) | 517 (51.91) |
 Types of residence | |||||
  Have property rights | 606 (86.57) | 79 (84.95) | 84 (87.50) | 92 (85.98) | 861 (86.45) |
  No property rights | 94 (13.43) | 14 (15.05) | 12 (12.50) | 15 (14.02) | 135 (13.55) |
 Size of residence | |||||
  < 90 m2 | 315 (45.00) | 46 (49.46) | 46 (47.92) | 53 (49.53) | 460 (46.18) |
  90–140 m2 | 309 (44.14) | 40 (43.01) | 43 (44.79) | 45 (42.06) | 392 (39.36) |
  > 140 m2 | 76 (10.86) | 7 (7.53) | 7 (7.29) | 9 (8.41) | 99 (9.94) |
Cognitive factors | |||||
 Degree of pregnancy knowledge | |||||
  Incomprehension | 4 (0.57) | 0 (0.00) | 0 (0.00) | 1 (0.93) | 5 (0.50) |
  General understanding | 662 (94.57) | 90 (96.77) | 91 (94.79) | 101 (94.39) | 944 (94.78) |
  Deep understanding | 34 (4.86) | 3 (3.23) | 5 (5.21) | 5 (4.67) | 47 (4.72) |
 Attending maternity school | |||||
  Yes | 388 (55.43) | 47 (50.54) | 57 (59.38) | 70 (65.42) | 562 (56.43) |
  No | 312 (44.57) | 46 (49.46) | 39 (40.63) | 37 (34.58) | 434 (43.57) |
 Planned pregnancy | |||||
  Intended pregnancy | 529 (75.58) | 63 (67.74) | 73 (76.04) | 73 (68.22) | 738 (74.25) |
  Unintended pregnancy | 158 (22.64) | 26 (27.96) | 22 (22.92) | 32 (29.91) | 238 (23.94) |
  Unknown | 13 (1.58) | 4 (4.30) | 1 (1.04) | 2 (1.87) | 20 (2.01) |
 The recognition of this pregnancy | |||||
  Task | 44 (6.29) | 6 (6.45) | 15 (15.63) | 10 (9.35) | 75 (7.53) |
  Burden | 26 (3.71) | 4 (4.30) | 7 (7.29) | 5 (4.67) | 42 (4.22) |
  Pleasure | 625 (89.29) | 83 (89.25) | 74 (77.08) | 89 (83.18) | 871 (87.45) |
  Other | 5 (0.71) | 0 (0.00) | 0 | 3 (2.80) | 8 (0.80) |
 Concern for fetal health | |||||
  Yes | 651 (93.13) | 87 (93.55) | 92 (95.83) | 103 (96.26) | 933 (93.77) |
  No | 48 (6.87) | 6 (6.45) | 4 (4.17) | 4 (3.74) | 62 (6.23) |
Family support | |||||
 Gender expectations for the fetus of the spouse | |||||
  No | 575 (82.14) | 75 (80.65) | 70 (72.92) | 76 (71.03) | 796 (79.92) |
  Boys | 59 (8.43) | 9 (9.68) | 14 (14.58) | 12 (11.21) | 94 (9.44) |
  Girls | 66 (9.43) | 9 (9.68) | 12 (12.50) | 19 (17.76) | 106 (10.64) |
 Marital relationship in the last 3 monthsa | |||||
  Good | 649 (92.71) | 72 (77.42) | 84 (87.50) | 78 (72.90) | 883 (88.65) |
  General | 50 (7.14) | 21 (22.58) | 12 (12.50) | 27 (25.23) | 110 (11.04) |
  Poor | 2 (1.87) | 0 (0.00) | 0 (0.00) | 1 (0.14) | 3 (0.30) |
 Relationship with parents-in-law in the last 3 months | |||||
  Good | 594 (84.86) | 80 (86.02) | 75 (78.13) | 94 (87.85) | 843 (84.64) |
  General | 104 (14.86) | 12 (12.90) | 19 (19.79) | 12 (11.21) | 147 (14.76) |
  Poor | 2 (0.29) | 1 (1.08) | 2 (2.08) | 1 (0.93) | 6 (0.60) |
 Relationship with own parents in the last 3 months | |||||
  Good | 658 (94.00) | 92 (98.92) | 87 (90.63) | 103 (96.26) | 940 (94.38) |
  General | 42 (6.00) | 1 (1.08) | 9 (9.38) | 4 (3.74) | 56 (5.62) |
 Obstetric factors | |||||
  Gravidity (Mean ± SD) | 2.09 ± 1.27 | 2.29 ± 1.54 | 1.96 ± 129 | 2.23 ± 1.43 | 2.11 ± 1.31 |
  Parity (Mean ± SD) | 0.08 ± 0.30 | 0.03 ± 0.18 | 0.09 ± 0.33 | 0.09 ± 0.29 | 0.08 ± 0.29 |
  Spontaneous abortion (Mean ± SD) | 0.13 ± 0.43 | 0.26 ± 0.66 | 0.16 ± 0.49 | 0.27 ± 0.70 | 0.16 ± 0.50 |
  Induced abortion (Mean ± SD) | 0.90 ± 1.12 | 0.99 ± 1.33 | 0.80 ± 0.97 | 0.99 ± 1.20 | 0.91 ± 1.14 |
 Morning sickness | |||||
  Yes | 597 (85.29) | 81 (87.10) | 87 (90.625) | 99 (92.52) | 864 (86.75) |
  No | 103 (14.71) | 12 (12.90) | 9 (9.375) | 8 (7.48) | 132 (13.25) |
 Previous history about obstetrical and gynecological disease | |||||
  Yes | 406 (0.58) | 5356.99) | 61 (63.54) | 72 (67.29) | 592 (59.44) |
  No | 294 (0.42) | 40 (43.01) | 35 (36.46) | 35 (32.71) | 404 (40.56) |
 Assisted reproduction | |||||
  Yes | 12 (1.71) | 2 (2.15) | 0 (0.00) | 3 (2.80) | 17((1.71) |
  No | 688 (98.29) | 91 (97.85) | 96 (100.00) | 104 (97.20) | 979 (98.29) |