Table 1.
Demographic characteristics of the subjects
| variable | Groups | Frequency(percentage) |
|---|---|---|
| sex | male | 18(60%) |
| female | 12(40%) | |
| Age(months) | minimum | 14 mo |
| maximum | 48 mo | |
| Age(years) | Mean(percentile25-75) | 2.3(2.0-2.6) |
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