R_ILLEGITIMATE = (BIRTH_LEGIT:ill * 100.0) / BIRTH_TOT:total
| Data Role | Period Covered | Authority | Source | Details | Method |
|---|---|---|---|---|---|
| BIRTH_LEGIT:ill | 1911 to 1920 | RG_AR | Annual Report | Registrar General, Annual Report (HM Stationery Office) , | Exact count provided by a government statistical office for this area |
| BIRTH_LEGIT:ill | 1922 to 1973 | RG_SR | Statistical Review | Registrar General, Statistical Review (HM Stationery Office) , | Exact count provided by a government statistical office for this area |
Illegitimate Births as a percentage of all births. Until quite recently, vital registration statistics separately counted the number of children born to un-married parents.