TABLE 1.
Sample demographics1
| Variable | Overall (n = 248) | FC group (n = 121) | FCZ group (n = 127) |
| Mother’s age, y | 27.2 ± 5.84 | 27.3 ± 5.76 | 27.0 ± 5.94 |
| Mother’s education, y | 11.2 ± 2.65 | 11.3 ± 2.97 | 11.1 ± 2.30 |
| Number of siblings | 0.85 ± 0.95 | 0.83 ± 0.93 | 0.86 ± 0.97 |
| Mother’s occupation2 | 3.23 ± 3.98 | 3.60 ± 4.21 | 2.87 ± 3.74 |
| Single mother | 8 | 12* | 5 |
| Family owns car | 5 | 7 | 4 |
| Family owns radio | 86 | 83 | 83 |
| Family owns television | 97 | 96 | 98 |
| Family owns telephone | 75 | 79 | 72 |
| Family owns refrigerator | 60 | 63 | 57 |
1
Values for continuous variables are means ± SDs or percentages. *Different from FCZ, P < 0.05. FC, supplement containing copper and iron; FCZ, supplement containing iron plus copper and zinc; n refers to the sample size represented by means in the respective columns.
2
Mother's occupation was rated on a scale from 1 to 15, with 1 being the poorest/least prestigious occupation, and 15 being the highest.