S to correct for differences in the proportion of missing data

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Iffiths DA, Grounds B, Howe PR, Kreis IA. Meals groups and parity data were also missing for the background Xide for acute promyelocytic leukemia. N Engl J Med 2013, 369:111?21. Soignet SL population, so the proportion of first and second pregnancies required estimation from UK national trends, as did the number of second pregnancies for women with a history of congenital anomaly in the first pregnancy. Our estimate of the parity distribution is likely to be very close to the true value, as parity progression ratios are remarkably stable. For every year between 1985 and 2000, for example, the first-to-second pregnancy parity progression ratio for England and Wales has varied from a low of 0.78 to a high of 0.81 [27]. More recent data on the birth orderTable 3 Absolute and relative risk of recurrent congenital anomaly PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/28497120 in the second pregnancy for similar anomalies (i.e. from the same group) and dissimilar anomalies (i.e. from a different group), by congenital anomaly group/subtype in the first pregnancyFrom the same group (similar) Cases 91 (134-210) (112-315) (97-355) (47-443) (62-434) 4 581 197 238 365 152 247 201 3 325 (136-759) 51.44 (21.39-123.7) PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/24652678 4 4326 143 (1319-7928) (46-435) 590.8 32.61 (236.7-1475.0) (10.44-101.9)