TABLE 2.
Urinary iodine concentration (UIC) in μg/L among women in pregnancy and different post‐partum stages in the LiN study
| Pregnant women | 6 weeks post‐partum | 6 months post‐partum | 12 months post‐partum | 18 months post‐partum | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | n | n | n | n | ||||||
| UIC (μg/L) | 1,004 | 79 (47–132) | 915 | 57 (34–86) | 849 | 70 (42–113) | 733 | 79 (44–120) | 714 | 87 (56–127) |
| Estimated iodine intake a (μg/day) | 801 | 140 (77–228) | 749 | 87 (51–196) | 706 | 109 (63–176) | 608 | 119 (68–189) | 593 | 133 (84–196) |
| UIC lactating women (μg/L) | NA | NA | 652 | 56 (33–83) | 655 | 69 (41–113) | 288 | 80 (47–118) | 63 | 103 (73–146) |
| UIC nonlactating women (μg/L) | NA | NA | 33 | 74 (44–108) | 131 | 72 (46–114) | 342 | 76 (41–123) | 505 | 85 (54–129) |
| Estimated iodine intake nonlactating women (μg/day) | NA | NA | 25 | 127 (79–227) | 106 | 110 (61–184) | 297 | 116 (66–190) | 438 | 132 (84–193) |
Note: Values for UIC and estimated iodine intake are given as median (p25–p75). NA: Not applicable. Differences in UIC between lactating and nonlactating women were done by Mann–Whitney U test, P = 0.008, 6 weeks pp; P = 0.634, 6 months pp; P = 0.352, 12 months pp; P = 0.058, 18 months pp.
a
Iodine intake was estimate using the following formula UIC × 0.0235 × weight in kg (prepregnancy weight was used for post‐partum women) (IOM, 2001).