Skip to main content

Table 3 Hazard ratios (HRs) for stillbirth given any nitrosatable prescription drug intake during the first 22 weeks of pregnancy by levels of maternal drinking water nitrate concentration

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) Any nitrosatable prescription drug intake during the first 22 weeks of pregnancy No stillbirth Stillbirth HR (95% CI)
Unadjusted Adjusteda
≤1 No 127,695 518 1 1
Yes 23,738 98 1.03 (0.83–1.28) 0.89 (0.61–1.30)
> 1- ≤ 2 No 170,289 581 1 1
Yes 28,492 132 1.38 (1.14–1.67) 1.55 (1.15–2.09)
> 2- ≤ 5 No 181,243 625 1 1
Yes 33,377 124 1.10 (0.91–1.34) 1.20 (0.87–1.66)
> 5- ≤ 25 No 52,442 192 1 1
Yes 10,779 48 1.24 (0.91–1.70) 1.32 (0.73–2.37)
> 25 No 18,904 77 1 1
Yes 3440 16 1.17 (0.68–2.01) 1.32 (0.60–2.90)
  1. aAdjusted for parity, urbanicity and maternal age, body mass index, smoking, education and occupation