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Table 2 Numbers of women and hospital records for each ascertainment period

From: Use of hospitalisation history (lookback) to determine prevalence of chronic diseases: impact on modelling of risk factors for haemorrhage in pregnancy

Time sequence No. (%) of women
(N = 53,438)
No. (%) of hospital records
(N = 113,478)
Transfer admission* 1,806 (3.4%) 1,831 (1.6%)
At birth admission 53,438 (100%) 53,438 (47.1%)
During pregnancy 15,284 (28.6%) 25,351 (22.3%)
Estimated day preceding pregnancy to <2 years prior to delivery 9,845 (18.4%) 16,640 (14.7%)
2 to <3 years prior to delivery 4,662 (8.7%) 6,930 (6.1%)
3 to <4 years prior to delivery 3,672 (6.9%) 5,158 (4.5%)
4 to <5 years prior to delivery 2,954 (5.5%) 4,130 (3.6%)
  1. * Hospital records for any associated transfer to another hospital after the delivery but prior to discharge home.