Table 1 Univariate regression analysis of factors correlated with performance intelligent quotient (IQ)
Characteristics | Mean ± SD | Range (min–max) | Intercept | Coefficient | Standard error | 95 % CI | p-value |
|---|---|---|---|---|---|---|---|
1. Age at menarche (years) | 11.8 ± 1.0 | 8.2–15.0 | 128.06 | −1.164 | 0.585 | −2.314, −0.014 | 0.047* |
2. BMI (kg/m2) | 19.4 ± 4.1 | 10.4–39.1 | 121.71 | −0.339 | 0.102 | −0.539, −0.139 | 0.001* |
3. Maternal age at birth (years) | 31.9 ± 5.2 | 19.0–54.0 | 104.56 | 0.241 | 0.080 | 0.085, 0.396 | 0.003* |
4. Watching TV (hours) | 2.7 ± 2.9 | 0.0–14.0 | 116.09 | −0.367 | 0.147 | −0.656, −0.078 | 0.013* |
5. Sleeping time (hours) | 7.1 ± 1.2 | 5.0–9.0 | 121.72 | −0.849 | 0.351 | −1.536, −0.160 | 0.016* |