Twinning rates and social class in Great Britain.
We examined like and unlike sex twinning rates in Great Britain by social class over the period 1974-85. Although twinning rates are believed to have changed over that period, we found no evidence of differential change by social class, suggesting that any factors affecting twinning are widespread in the population.
Murphy
M
M
Department of Community Medicine and General Practice, Radcliffe Infirmary, Oxford, London.
Botting
B
B
D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012923:Social Class; D013997:Time Factors; D014427:Twins; D006113:United Kingdom