| Pooled | Early pregnancy | Middle pregnancy | Late 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 | 1225 | 2903 | 380 | 958 | 531 | 1197 | 314 | 748 |
Age, years | ||||||||
  ≥ 35* | 154 (12.57) | 393 (13.54) | 49 (12.89) | 139 (14.51) | 62 (11.68) | 143 (11.95) | 43 (13.69) | 111 (14.84) |
Education status | ||||||||
  ≤ 9 years | 447 (36.61) | 941 (32.48)* | 106 (27.97) | 243 (25.47) | 222 (42.05) | 419 (35.03)* | 119 (37.90) | 279 (37.35) |
 Senior high school and college | 293 (24.00) | 753 (25.99)* | 106 (27.97) | 263 (27.57) | 120 (22.73) | 327 (27.34)* | 67 (21.34) | 163 (21.82) |
 Bachelor’s degree and higher | 481 (39.39) | 1203 (41.53)* | 167 (44.06) | 448 (46.96) | 186 (35.23) | 450 (37.63)* | 128 (40.76) | 305 (40.83) |
Occupation status | ||||||||
 Mental | 1003 (81.88) | 2286 (78.75)* | 303 (79.74) | 743 (77.56) | 434 (81.73) | 959 (80.12) | 266 (84.71) | 584 (78.07) |
 Physical | 222 (18.12) | 617 (21.75)* | 77 (20.26) | 215 (22.44) | 97 (18.27) | 238 (19.88) | 48 (15.29) | 164 (21.93) |
Family income per person last years, yuan | ||||||||
  < 100,000 | 274((20.28) | 514 (17.77)* | 58 (15.38) | 136 (14.26) | 117 (22.20) | 226 (18.94)* | 72 (22.93) | 152 (20.38) |
 100,000–200,000 | 525 (43.10) | 1195 (41.31)* | 153 (40.58) | 405 (42.45) | 233 (44.21) | 492 (41.24)* | 139 (44.27) | 298 (39.95) |
  ≥ 200,000 | 446 (36.52) | 1184 (40.93)* | 166 (44.03) | 413 (43.29) | 177 (33.59) | 475 (39.82)* | 103 (32.08) | 296 (39.68) |
Former smoker | 35 (2.87) | 70 (2.42) | 10 (2.65) | 25 (2.62) | 17 (3.23) | 31 (2.59) | 8 (2.55) | 14 (1.87) |
Former drinker | 133 (11.02) | 293 (10.11) | 34 (9.04) | 96 (10.06) | 63 (12.05) | 129 (10.79) | 36 (11.69) | 68 (9.09) |
First pregnancy | 1488 (51.26) | 634 (51.76) | 466 (48.64) | 186 (48.95) | 288 (54.24) | 636 (53.13) | 160 (50.96) | 386 (51.60) |
Consumed iodine-rich food in the past 3 months | 930 (75.92) | 2383 (82.09)* | 284 (74.74) | 743 (77.56) | 406 (76.46) | 1011 (84.46) | 240 (76.43) | 629 (84.09)* |
Consumed iodized nutritional supplements in the past 3 months | 82 (6.69) | 516 (17.77)* | 27 (7.11) | 134 (13.99)* | 32 (6.03) | 222 (18.55)* | 23 (7.32) | 160 (21.93) |
Non-iodized salt | 331 (27.02) | 651 (22.43)* | 102 (26.84) | 222 (23.17) | 146 (27.50) | 263 (21.97)* | 83 (26.43) | 166 (22.19) |
UIC, μg/L | 124.57 (73.79–199.77) | 143.67 (85.93–225.52)* | 135.87 (73.39–219.33) | 154.03 (91.40–246.95)* | 128.93 (79.71–204.42) | 142.23 (88.09–224.27)* | 110.88 (64.30–186.60) | 130.84 (71.29–201.67)* |
Iodine from iodine-rich food and salt, median(q1-q3), μg | 94.51 (25.26–180.00) | 124.56 (44.98–221.53)* | 69.48 (9.02–146.85) | 104.86 (34.33–200.61)* | 107.25 (42.55–185.07) | 133.98 (51.56–228.61)* | 109.44 (230.53–188.57) | 137.60 (47.72–241.05)* |
Iodine-intake groups, μg | ||||||||
  < 37.15 | 358 (29.22) | 644 (22.18)* | 148 (38.95) | 243 (25.37)* | 126 (23.73) | 243 (20.30)* | 84 (26.75) | 158 (21.12)* |
 37.15 ~ 113.54 | 334 (27.27) | 713 (24.56)* | 108 (28.42) | 260 (27.14)* | 146 (27.50) | 288 (24.06)* | 80 (25.48) | 165 (22.06)* |
 113.54 ~ 205.99 | 300 (24.49) | 726 (25.01)* | 68 (17.89) | 224 (23.38)* | 154 (29.00) | 318 (26.57)* | 78 (24.84) | 184 (24.60)* |
  ≥ 205.99 | 233 (19.02) | 820 (28.25)* | 56 (14.74) | 231 (24.11)* | 105 (19.07) | 348 (29.07)* | 72 (22.93) | 241 (32.22)* |
Hypothyroidism, % | 30 (2.45) | 63 (2.17) | 13 (3.42) | 20 (2.09) | 10 (1.88) | 24 (2.01) | 7 (2.23) | 19 (2.54) |