The overall prevalence of postpartum hemorrhage in the study population was 4.5% (50,565 of 1,114,071).
There was an increased prevalence of postpartum hemorrhage over the study period from 1997 to 2008
(Fig. 1). The yearly risk for postpartum hemorrhage calculated as OR was practically identical after adjustmentsfor maternal age, parity, smoking, and maternal prepregnancy BMI (data not shown). A linear regression was fitted to the percentage of women with a bleeding diagnosis each year of delivery using a least-squares method. The angle coefficient was 0.12 (95% CI 0.09 – 0.16) and highly statistically significant (t7.65, P.001). If instead a line was fitted to the OR (adjusted for age, parity, smoking, and BMI), then the angle coefficient was 0.005 with an error of 0.004
(t1.26, P.24). The increased prevalence of postpartum hemorrhage thus seems to be attributable to changes in population characteristics.
The overall prevalence of postpartum hemorrhage in the study population was 4.5% (50,565 of 1,114,071).There was an increased prevalence of postpartum hemorrhage over the study period from 1997 to 2008(Fig. 1). The yearly risk for postpartum hemorrhage calculated as OR was practically identical after adjustmentsfor maternal age, parity, smoking, and maternal prepregnancy BMI (data not shown). A linear regression was fitted to the percentage of women with a bleeding diagnosis each year of delivery using a least-squares method. The angle coefficient was 0.12 (95% CI 0.09 – 0.16) and highly statistically significant (t7.65, P.001). If instead a line was fitted to the OR (adjusted for age, parity, smoking, and BMI), then the angle coefficient was 0.005 with an error of 0.004(t1.26, P.24). The increased prevalence of postpartum hemorrhage thus seems to be attributable to changes in population characteristics.
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