Table 3.

Adjusted rates and 95% confidence intervals of late fetal death compared with characteristics of pregnancy and birthweight ratio based on multiple logistic regression. Model includes significant interactions between risk factors and birthweight ratio

	Small for gestational age
	None		Mild		Extreme
Variable	Rate/1000		Rate/1000		Rate/1000
	(95% CI)		(95% CI)		(95% CI)
Maternal age (years):
15-19	1.4 (1.1 to 1.7)		3.8 (3.1 to 4.8)		31.1 (24.9 to 38.8)
20-34*	1.4 (1.2 to 1.5)		3.8 (3.4 to 4.3)		31.1 (27.5 to 35.1)
⩾35	2.0 (1.8 to 2.2)		5.6 (4.9 to 6.4)		44.9 (39.1 to 51.4)
Parity:
No previous births	1.6 (1.5 to 1.7)		3.6 (3.3 to 4.1)		36.7 (32.7 to 41.1)
One or more previous births*	1.4 (1.2 to 1.5)		3.8 (3.4 to 4.3)		31.1 (27.5 to 35.1)
Smoking (cigarettes per day):
0*	1.4 (1.2 to 1.5)		3.8 (3.4 to 4.3)		31.1 (27.5 to 35.1)
1-9	1.5 (1.3 to 1.8)		3.5 (2.9 to 4.1)		26.9 (23.0 to 31.5)
⩾10	2.3 (2.0 to 2.7)		3.8 (3.1 to 4.5)		28.3 (23.8 to 33.5)
Maternal height (cm):
⩽154	1.7 (1.1 to 2.4)		2.3 (1.4 to 3.7)		22.2 (15.3 to 32.1)
155-174*	1.4 (1.2 to 1.5)		3.8 (3.4 to 4.3)		31.1 (27.5 to 35.1)
⩾175	1.4 (1.2 to 1.7)		4.0 (3.3 to 4.9)		32.8 (26.9 to 39.9)
Type of birth:
Singleton*	1.4 (1.2 to 1.5)		3.8 (3.4 to 4.3)		31.1 (27.5 to 35.1)
Twin	4.6 (3.6 to 6.0)		4.3 (3.2 to 5.7)		22.8 (18.1 to 28.7)
Hypertensive diseases:
None*	1.4 (1.2 to 1.5)		3.8 (3.4 to 4.3)		31.1 (27.5 to 35.1)
Severe pre-eclampsia	3.1 (2.2 to 4.4)		8.7 (6.1 to 12.3)		21.7 (15.0 to 31.2)
Other	1.3 (1.0 to 1.6)		3.6 (2.7 to 4.6)		15.7 (11.6 to 21.3)

^*Reference group.