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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.