Table 2.
Median and interquartile range of 24 h urinary iodine concentration (UIC), salt intake and iodine intake, and the number percentage of mothers with UIC<100 µg/l and UIC<50 µg/l, according to age group, education level, family socio-economic status (SES), and knowledge, attitude and behaviour categories, Tehran, Iran
| 24 h UIC (µg/l) | Salt intake (g/d) | Iodine intake (µg/d) | UIC<100 µg/l | UIC<50 µg/l | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Variable | n | Median | IQR | Median | IQR | Median | IQR | n | % | n | % |
| All mothers | 290 | 73·0 | 35·5–140·5 | 8·0 | 5·9–10·2 | 142·7 | 28·1–249·3 | 182 | 62·8 | 105 | 36·2 |
| Age (years) | |||||||||||
| 19–24 | 10 | 84·5* | 40·0–155·0 | 9·5 | 8·3–11·8 | 120·2 | 24·5–238·5 | 7 | 70·0 | 4 | 40·0 |
| 25–34 | 46 | 80·0 | 44·0–164·9 | 7·5 | 5·8–10·5 | 134·9 | 27·0–233·6 | 26 | 56·5 | 16 | 34·8 |
| 35–49 | 131 | 85·0 | 47·0–151·0 | 8·3 | 6·0–10·3 | 159·3 | 30·8–291·9 | 77 | 58·8 | 38 | 29·0 |
| ≥50 | 103 | 54·0 | 31·5–109·0 | 7·2 | 5·7–9·6 | 110·9 | 28·5–212·6 | 72 | 69·9 | 47 | 45·6 |
| Education level | |||||||||||
| Illiterate | 24 | 37·0* | 28·5–54·5 | 7·6 | 6·1–9·6 | 32·8* | 10·3–148·6 | 22* | 91·7 | 17* | 70·8 |
| Primary | 127 | 62·2 | 32·2–112·0 | 8·4 | 5·9–10·6 | 117·5 | 20·5–226·0 | 85 | 66·9 | 53 | 41·7 |
| Secondary | 114 | 87·0 | 49·0–160·0 | 7·9 | 5·8–9·9 | 164·0 | 61·4–296·2 | 63 | 55·3 | 30 | 26·3 |
| Higher | 25 | 127·0 | 59·0–176·1 | 8·1 | 5·8–9·0 | 200·3 | 93·5–324·4 | 12 | 48·0 | 5 | 20·0 |
| Family SES | |||||||||||
| High | 123 | 95·0 | 49·5–161·4 | 7·7 | 5·7–9·6 | 205·2 | 122·7–299·6 | 62 | 50·4 | 32 | 26·0 |
| Middle | 105 | 72·0 | 40·0–142·0 | 8·1 | 5·9–9·9 | 94·1 | 14·7–218·4 | 67 | 63·8 | 34 | 32·4 |
| Low | 62 | 39·5* | 27·0–74·0 | 8·4 | 6·2–11·8 | 32·9* | 15·4–160·0 | 53* | 85·5 | 39* | 62·9 |
| Knowledge score | |||||||||||
| High | 103 | 68·5 | 37·0–138 | 8·2 | 6·4–10·4 | 152·2 | 30·4–264·0 | 69 | 67·0 | 37 | 35·9 |
| Intermediate | 85 | 70·0 | 36·0–136·0 | 7·1 | 5·8–9·6 | 147·3 | 31·2–229·6 | 51 | 60·0 | 29 | 34·1 |
| Low | 100 | 76·5 | 33·0–144·4 | 7·7 | 5·6–9·6 | 127·7 | 24·7–233·2 | 62 | 62·0 | 39 | 39·0 |
| Attitude score | |||||||||||
| High | 103 | 87·0 | 47·0–152·5 | 7·5 | 5·7–9·3 | 168·1 | 53·3–288·0 | 58 | 56·3 | 28 | 27·2 |
| Intermediate | 106 | 72·0 | 34·0–144·4 | 8·1 | 6·1–10·2 | 148·7 | 60·8–232·6 | 67 | 63·2 | 38 | 35·8 |
| Low | 76 | 54·0* | 30·0–106·4 | 8·9 | 5·8–10·5 | 39·0* | 15·4–209·0 | 57* | 72·2 | 39* | 49·4 |
| Behaviour score | |||||||||||
| High | 39 | 112·0 | 59·9–178·4 | 8·1 | 6·5–9·7 | 199·8 | 97·5–285·9 | 16 | 41·0 | 8 | 20·5 |
| Intermediate | 184 | 78·0 | 41·5–144·0 | 7·5 | 5·7–9·6 | 157·4 | 36·2–251·6 | 115 | 62·5 | 60 | 32·6 |
| Low | 65 | 46·0* | 27·0–87·0 | 9·2 | 6·0–11·0 | 42·8* | 16·3–163·1 | 51* | 78·5 | 37* | 56·9 |
*P<0·05.