Table 2.
Salt iodine content, urinary iodine concentration and knowledge, attitude and practice scores in the control and intervention groups at baseline and follow-up
| Intervention group | Control group | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Baseline | Follow-up | Baseline | Follow-up | ||||||
| Median | IQR | Median | IQR | Median | IQR | Median | IQR | P for SMS effect* | |
| Salt iodine content (ppm) | 21·2 | 3·2, 31·7 | 31·7† | 21·2, 38·1 | 20·1 | 2·1, 31·7 | 31·7† | 20·1, 38·1 | 0·576 |
| Urinary iodine concentration (μg/l) | 79·0 | 46·0, 127·1 | 99·0† | 54·0, 215·0 | 77·5 | 36·5, 132·1 | 87·2 | 51·7, 152·0 | 0·144 |
| Knowledge score | 20 | 16, 23 | 26†,‡ | 21, 28 | 20 | 15, 24 | 23† | 16, 27 | 0·004 |
| Attitude score | 34 | 32, 36 | 36†,‡ | 33, 39 | 34 | 32, 37 | 34 | 31, 37 | 0.027 |
| Practice score | 5 | 4, 5 | 6† | 5, 6 | 4 | 4, 5 | 5† | 4, 6 | 0·395 |
IQR, interquartile range; SMS, short message services.
*P for the difference in variables between the intervention and control groups.
†Median value was significantly different from that at baseline (P < 0·05).
‡Median value was significantly different from that of the control group (P < 0·05).