TABLE 1.
Sociodemographic characteristics of the weighted survey participants1
| UIC, μg/L | |||
|---|---|---|---|
| Characteristics | Overall (n1 = 2985) | Median | 25th, 75th percentiles |
| Mean (SD) age, y | 31.9 (8.4) | ||
| Age group, n (%) | |||
| 20–30 y | 1474 (49.4) | 171.1 | 68.6, 322.6 |
| 31–40 y | 928 (31.1) | 143.3 | 66.7, 305.0 |
| 41–49 y | 583 (19.5) | 133.8 | 63.1, 290.7 |
| Pregnancy status, n (%) | |||
| Pregnant | 266 (8.9) | 156.1 | 64.6, 260.4 |
| Not pregnant | 2719 (91.1) | 152.6 | 66.7, 315.9 |
| Breastfeeding status, n (%) | |||
| Breastfeeding | 930 (31.2) | 117.3 | 51.2, 262.1 |
| Not breastfeeding | 2055 (68.9) | 174.0 | 76.0, 328.1 |
| Iodine content in salt, n (%) | |||
| Inadequately iodized salt (<15 ppm) | 804 (33.3) | 93.6 | 43.1, 197.9 |
| Adequately iodized salt (≥15 ppm) | 1613 (66.7) | 226.9 | 112.9, 1369.0 |
| Educational status, n (%) | |||
| No education | 507 (17.0) | 104.3 | 46.4, 212.6 |
| Primary education | 1923 (64.4) | 144.3 | 64.6, 303.6 |
| Secondary/higher | 555 (18.6) | 239.8 | 121.9, 395.2 |
| Wealth index status,2n (%) | |||
| Lowest | 1100 (36.9) | 92.3 | 45.6, 194.4 |
| Middle | 530 (17.8) | 113.7 | 51.1, 233.4 |
| Highest | 1355 (45.4) | 243.9 | 125.1, 403.9 |
| Place of residence, n (%) | |||
| Urban | 993 (33.3) | 261.3 | 140.8, 414.4 |
| Rural | 1992 (66.8) | 108.0 | 50.2, 234.2 |
| Employment status, n (%) | |||
| Employed | 2396 (80.3) | 144.3 | 62.8, 291.4 |
| Unemployed | 589 (19.7) | 195.8 | 87.0, 371.6 |
| Geographic zone,3n (%) | |||
| Western | 306 (10.2) | 83.2 | 45.9, 165.3 |
| Northern | 355 (11.9) | 224.2 | 99.4, 401.2 |
| Central | 304 (10.2) | 167.4 | 73.4, 317.9 |
| Southwest/Southern Highlands | 482 (16.2) | 141.0 | 54.3, 271.4 |
| Southern | 161 (5.4) | 103.0 | 53.5, 173.4 |
| Lake | 817 (27.4) | 116.3 | 48.3, 232.7 |
| Eastern | 468 (15.7) | 347.8 | 185.0, 479.8 |
| Zanzibar | 92 (3.1) | 178.5 | 94.1, 279.9 |
1
n = 2985. ppm, parts per million; UIC, urinary iodine concentration.
2
We categorized wealth index from 5 quintiles into 3 categories by grouping poorest and poorer into 1 category as lowest, middle, and richer and richest into another category as highest (lowest, middle, and highest).
3
Geographic zone was categorized from 9 zones into 8 zones by grouping Southern and Southwest Highlands zone into Southwest/Southern Highlands (Western, Northern, Central, Southwest/Southern Highlands, Southern, Lake, Easter, and Zanzibar) (29).