Table 2

The relationship of maternal smoking (after childbirth) with infant feeding and social class; values are mean (SD) except where stated otherwise

Maternal smokingp Value
Yes (n=307)No (n=911)
Duration of breast feeding (weeks)2-150 8.5 (11.4)16.6 (15.2)<0.001
Proportion of babies never breast fed2-151(%)31.623.8<0.01
Age at introduction to formula (weeks)2-150 6.6 (9.1)11.8 (11.5)<0.001
Age at introduction to solids2-150 13.6 (4.5)14.9 (4.8)NS
Lower socioeconomic group2-151 2-152 (%)31.816.0<0.001
  • 2-150 Mann-Whitney U test; NS = not significant.

  • 2-151 χ2 test with Yates's correction.

  • 2-152 Social classes 4 and 5 according to the Registrar General's classification.