Table 3.
Median urinary iodine concentration (UIC), ratio of iodine to creatinine (I:Cr) and serum thyroid-stimulating hormone (TSH) according to adherence to recommendations on fish and dairy intake* among the study participants: pregnant women aged 19–43 years (n 162), Reykjavik, Iceland, November 2007 to February 2009
| Fish ≥2 times/week as a main meal | Fish <2 times/week as a main meal | Dairy ≥2 portions/d | Dairy <2 portions/d | Both fish ≥2 times/week as a main meal and dairy ≥2 portions/d | Either fish ≥2 times/week as a main meal or dairy ≥2 portions/d | Neither fish ≥2 times/week as a main meal nor dairy ≥2 portions/d | |
|---|---|---|---|---|---|---|---|
| (n 87) | (n 75) | (n 97) | (n 65) | (n 49) | (n 74) | (n 39) | |
| UIC (μg/l) | 180 | 180 | 200 | 170 | 220 | 170 | 160 |
| I:Cr (μg/g) | 173 | 175 | 201 | 147 | 190 | 175 | 149 |
| TSH (mmol/l) | 1·38 | 1·61 | 1·47 | 1·50 | 1·35 | 1·57 | 1·50 |
| Supplements† | |||||||
| n | 44 | 39 | 50 | 33 | 23 | 43 | 23 |
| % | 51 | 52 | 52 | 51 | 47 | 58 | 58 |
*
According to the Icelandic food-based dietary guidelines( 21 ) and guidelines to pregnant women( 22 ). Fish as a main meal is recommended at least twice weekly. Consumption of two portions of milk or other dairy products daily is recommended (one portion equals 250 ml milk or 25 g cheese).
†
Number and percentage of women recording daily use of dietary supplements that might contain iodine.