| Pooled | Early pregnancy | Middle pregnancy | Later pregnancy | ||||
---|---|---|---|---|---|---|---|---|
TPOAb/TgAb/TRAb(+) | TPOAb/TgAb/TRAb(−) | TPOAb/TgAb/TRAb(+) | TPOAb/TgAb/TRAb(−) | TPOAb/TgAb/TRAb(+) | TPOAb/TgAb/TRAb(−) | TPOAb/TgAb/TRAb(+) | TPOAb/TgAb/TRAb(−) | |
N | 1439 | 3196 | 465 | 1072 | 617 | 1315 | 357 | 809 |
Age, years | 29 (26–32) | 29 (26–32) | 29 (27–33) | 29 (27–32)* | 29 (26–32) | 29 (26–32) | 29 (26–32) | 29 (26–33) |
  ≥ 35 | 193 (13.41) | 448 (14.02) | 67 (14.41) | 158 (14.74) | 77 (12.48) | 166 (12.62) | 49 (13.73) | 124 (15.33) |
Education status | ||||||||
  ≤ 9 years | 481 (33.52) | 977 (30.64) | 112 (24.14) | 257 (24.06) | 242 (39.41) | 435 (33.13)* | 127 (35.57) | 285 (35.27) |
 Senior high school and college | 330 (23.00) | 809 (25.37) | 123 (26.51) | 282 (26.40) | 134 (21.82) | 351 (26.73)* | 73 (20.45) | 176 (21.78) |
 Bachelor’s degree and higher | 624 (43.48) | 1403 (43.09) | 229 (49.35) | 529 (49.53) | 238 (38.76) | 527 (40.14)* | 157 (43.98) | 347 (42.95) |
Occupation status | ||||||||
 Mental | 1178 (81.86) | 2525 (79.01)* | 370 (79.57) | 834 (77.80) | 370 (79.57) | 834 (77.80) | 302 (84.59) | 633 (78.24)* |
 Physical | 261 (18.14) | 671 (20.99)* | 95 (20.43) | 238 (22.20) | 95 (20.43) | 238 (22.20) | 55 (15.41) | 176 (21.76)* |
Family income per person last years, yuan | ||||||||
  < 100,000 | 278 (19.41) | 542 (17.02)* | 69 (14.94) | 145 (13.58) | 131 (21.37) | 240 (18.32)* | 78 (21.85) | 157 (19.48) |
 100,000–200,000 | 605 (42.25) | 1296 (40.70)* | 178 (38.53) | 451 (42.23) | 271 (44.21) | 530 (40.46)* | 156 (43.70) | 315 (39.08) |
  ≥ 200,000 | 549 (38.34) | 1346 (42.27)* | 215 (46.54) | 472 (44.19) | 211 (34.42) | 540 (41.22)* | 123 (34.45) | 334 (41.44) |
Former smoker | 42 (2.93) | 76 (2.38) | 13 (2.81) | 28 (2.62) | 20 (3.26) | 33 (2.51) | 9 (2.52) | 15 (1.85) |
Former drinker | 157 (11.07) | 323 (10.13) | 45 (9.80) | 109 (10.21) | 73 (11.99) | 144 (10.97) | 39 (11.14) | 70 (8.65) |
First pregnancy, | 744 (51.70) | 1640 (51.31) | 225 (48.39) | 519 (48.41) | 336 (54.46) | 704 (53.54) | 183 (51.26) | 417 (51.55) |
Previous thyroid disease | 214 (14.87) | 293 (9.17)* | 85 (18.28) | 114 (10.63)* | 86 (13.94) | 118 (8.97)* | 43 (12.04) | 61 (7.54) |
Consumed iodine-rich food in the past 3 months | 1060 (73.66) | 2610 (81.66)* | 329 (70.75) | 827 (77.15)* | 460 (74.55) | 1103 (83.88)* | 271 (75.91) | 680 (84.05)* |
Consumed iodized nutritional supplements in the past 3 months | 133 (9.24) | 585 (18.30)* | 53 (11.40) | 156 (14.56) | 49 (7.94) | 251 (19.09)* | 31 (8.68) | 178 (22.00)* |
Non-iodized salt | 428 (29.74) | 771 (24.12)* | 145 (31.18) | 274 (25.56)* | 184 (29.82) | 309 (23.50)* | 99 (27.73) | 188 (23.24) |
UIC, μg/L | 125 (73.85–200.69) | 143.18 (84.92–224.95)* | 134.18 (75.57–216.03) | 153.86 (91.14–248.46)* | 129.97 (79.71–204.88) | 141.18 (85.64–221.00) | 110.69 (63.84–185.36) | 130.00 (71.60–201.39)* |
Iodine from iodine-rich food and salt, median(q1-q3), μg | 95.41 (23.81–180.00) | 123.36 (42.36–220.42)* | 73.02 (9.07–157.6) | 103.22 (32.68–200.27)* | 107.24 (39.58–182.87) | 131.19 (46.90–226.43)* | 109.34 (29.33–188.14) | 137.07 (48.05–238.13)* |
Iodine-intake groups, μg | ||||||||
  < 37.15 | 422 (29.32) | 737 (23.06)* | 176 (37.85) | 279 (26.03)* | 148 (23.99) | 286 (21.75)* | 98 (27.45) | 172 (21.26)* |
 37.15 ~ 113.54 | 380 (26.41) | 778 (24.34)* | 125 (26.88) | 292 (27.24)* | 167 (27.071%) | 306 (23.27)* | 88 (24.65) | 180 (22.25)* |
 113.54 ~ 205.99 | 370 (25.71) | 789 (24.69)* | 92 (19.78) | 243 (22.67)* | 185 (29.98) | 347 (26.39)* | 93 (26.05) | 199 (24.60)* |
  ≥ 205.99 | 267 (18.55) | 892 (27.91)* | 72 (15.8) | 258 (24.07)* | 117 (18.96) | 376 (28.596%)* | 78 (21.85) | 258 (31.89)* |
Hypothyroidism | 42 (2.92) | 79 (2.47) | 15 (3.23) | 25 (2.33) | 15 (2.43) | 32 (2.43) | 12 (3.36) | 22 (2.72) |