Table 2.

Hazard ratio (HR) with 95% Confidence Interval (CI) for parental cardiovascular death by unit change in birth weight (per 500 gram) of first singleton offspring in Norway 1967–2002 with follow-up until 2009. Estimates were adjusted for year of birth and parental age.

First offspring birth weight	Mothers (n = 711 726)		Fathers (n = 700 212)
	HR (95%CI)	p for trend	HR (95%CI)	p for trend
500 to 3500 gram	0.75 (0.71–0.78)	<0.0001	0.94 (0.91–0.96)	<0.0001
≥3500 gram	0.96 (0.85–1.10)	0.57	0.99 (0.94–1.05)	0.70