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

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

Household NO3- average (mg/L) No stillbirth Stillbirth HR (95% CI)
Unadjusted Adjusteda
≤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)
  1. aAdjusted for parity, urbanicity and maternal age, body mass index, smoking, education and occupation