TABLE 4. Odds ratios for downward centile-crossing.

	Odds Ratio	Standard error	z	P value	95% CI
Uncomplicated pregnancies
1Maternal Height	0.05	0.03	-4.3	0.001	0.01- 0.19
1Maternal Weight	0.97	0.004	-7.3	0.001	0.96- 0.98
1Maternal BMI	0.94	0.01	-5.89	0.001	0.92- 0.96
Maternal smoking	1.27	0.15	1.96	0.05	1.00- 1.61
Primiparity	1.56	0.13	5.4	0.001	1.33- 1.84
Sex (female)	1.41	0.11	4.3	0.001	1.21- 1.65
2 Time to birth	0.80	0.03	-6.23	0.001	0.74-0.86
Preterm labor
	1.47	0.26	2.19	0.03	1.04-2.07

¹Tertiles;

²gestational age at birth minus gestational age at 24 week measurement.