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Maternal Hazard Ratio (HR) with 95% Confidence Interval (C. I.) for cardiovascular mortality by z-score by birth weight categories (<−1.5, −1.5 to 1.5 and >1.5) for first born singleton offspring born preterm (A) and term (B) in Norway 1967 to 2002, with follow-up to 2009. Estimates were adjusted for maternal age and year of birth and z-score was limited to −4 to +4 (43341 and 668385 mothers, respectively).
