Table 4 Adjusted relative risk of non-malformed singleton stillbirth.

Risk factors	Adjusted relative risk^*	95% CI	P-value
Maternal age, years
<20	0.94	0.58–1.52	0.8
20–34	1.00	NA	NA
≥35	1.05	0.92–1.19	0.5
Parity
0	1.19	1.05–1.35	0.006
≥1	1.00	NA	NA
Pre-pregnancy BMI, kg/m²
<18.5	0.82	0.69–0.97	0.02
18.5–22.9	1.00	NA	NA
23.0–29.9	1.04	0.89–1.21	0.6
≥30.0	1.12	0.83–1.50	0.5
Smoking
No	1.00	NA	NA
Yes	1.13	0.86–1.47	0.4
PIH
No	1.00	NA	NA
Yes	0.31	0.25–0.39	<0.001
Amniotic fluid volume
Oligohydramnios	0.66	0.51–0.86	0.002
Normal	1.00	NA	NA
Polyhydramnios	1.39	0.84–2.29	0.2
Infant size
SGA	3.78	3.31–4.32	<0.001
AGA	1.00	NA	NA
LGA	0.97	0.73–1.28	0.8

^*Adjusted for gestational age and explanatory variables in the table.
AGA: appropriate-for-gestational-age, BMI: body mass index, CI: confidence interval, LGA: large-for-gestational-age, NA: not applicable, PIH: pregnancy-induced hypertension, SGA: small-for-gestational-age.

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