Not unlike the Women's Circle of Health Study.
- 4204 Number of pregnancies reported in 1976 differed by 2 or more pregancies from the estimated number of pregancies in 1976 based on reported ages of children in 1978
- 6993 Number of living children differed from parity in 1978
- 2756 Number of children in 1978 less than reported number of children in 1976
- 765 women whose age at first birth (estimated from the reported ages of children in 1978) was greater than 3 years plus the age at first birth reported in 1976
- 763 women whose age at menarche was less that or equal to 8 years of age or greater than or equal to 22 years of age
- 83 Unknown parity
- 671 Age at any birth greater than the age at menopause.
- 23 Unknown age at menopause
- 73 male or invalid participant (REALLY!?)
- 9 became eligible very late
- 3776 unknown duration of use of HRT
- 8871 unknown weight at 18y, unknown weight/height in 1976
- 10,301 hysterectomy with one or no ovaries removed
- 750 missing information on ER/PR status
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