Prenatal nitrosatable prescription drug intake, drinking water nitrate, and the risk of stillbirth: a register- and population-based cohort of Danish pregnancies, 1997–2017

Table 2 Hazard ratios (HRs) for stillbirth for given maternal residential drinking water nitrate concentration during the first 22 weeks of pregnancy

Household NO3- average (mg/L)	No stillbirth	Stillbirth	HR (95% CI)
Household NO3- average (mg/L)	No stillbirth	Stillbirth	Unadjusted	Adjusted^a
≤1	151,433	616	1	1
> 1- ≤ 2	198,781	713	0.88 (0.79–0.98)	0.97 (0.80–1.18)
> 2- ≤ 5	214,620	749	0.86 (0.78–0.96)	0.88 (0.72–1.07)
> 5- ≤ 25	63,221	240	0.93 (0.80–1.08)	0.95 (0.73–1.24)
> 25	22,344	93	1.01 (0.81–1.26)	1.26 (0.89–1.79)

^aAdjusted for parity, urbanicity and maternal age, body mass index, smoking, education and occupation

ISSN: 1476-069X