R_FERTILITY = (BIRTH_TOT:total * 1000.0) / AGE_FERTILE:female/F
| Data Role | Period Covered | Authority | Source | Details | Method |
|---|---|---|---|---|---|
| BIRTH_TOT:total | 1871 | RG_QR | Quarterly Report | Registrar General, Quarterly Report (HM Stationery Office) , | Exact count provided by a government statistical office for this area |
| AGE_FERTILE:female/F | 1871 | SRC | GBH Source Documentation System | 1871 Census of England and Wales, Ages, Table 3 , 'Ages of Males and Females in Registrars' Sub-Districts' | Exact count provided by a government statistical office for this area |
Live births per thousand women aged 20 to 49. The General Fertility Rate is usually defined relative to the number of women aged 15 to 49, but in Britain the ages 20 to 49 are generally more appropriate.