Table 2. Logistic regression models with all explanatory variables for pre- and postnatal cases with trisomy 21.

	Estimate	Estimated OR (exp(estimate))	95% Confidence interval	P-value
Pre- and postnatal DS cases
Intercept	−12.7040	<10−5	NA	<10−5
Mother	0.1831	1.20	1.18–1.22	<10−5
Father	−0.0257	0.97	0.96–0.99	0.002
Prenatal DS cases
Intercept	−18.6631	<10−5	NA	<10−5
Mother	0.282	1.33	1.28–1.37	<10−5
Father	0.0055	1.01	0.98–1.03	0.69
Postnatal DS cases
Intercept	−11.3900	<10−5	NA	<10−5
Mother	0.1485	1.16	1.13–1.19	<10−5
Father	−0.0392	0.96	0.94–0.98	0.0001