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Logistic regression analyses of case – control study of Down syndrome children (c.i = confidence intervals).
| Variable | Univariate | Multiple |
| Odds ratio (95% c.i.) | Odds ratio (95% c.i.) | |
| Mother (per year) | 1.14* (1.07;1.20) | 1.07 (0.94;1.23) |
| Father (per year) | 1.14* (1.07;1.20) | 1.14 (0.99;1.32) |
| Maternal grandmother (per year) | 1.25* (1.19;1.32) | 1.30* (1.22;1.39) |
| Consanguineous marriage | 2.55* (1.35;4.81) | 1.84 (0.75;4.50) |
*p < 0.001
