Table 2

Factors that showed no interaction with the time periods studied

  • 2-150 The multivariate model controls for the following variables: disease and complications in pregnancy, birth weight, gestational age, birth order, mother's age at time of pregnancy, mother's and father's smoking habits during pregnancy, and social class/occupational status at the time of pregnancy.

  • 2-151 The multivariate model controls for the following variables: birth weight, gestational age, birth order, breast feeding over three months, waking at night, co-sleeping, sleeping position, dummy use, mother's and father's smoking habit during pregnancy, and social class/occupational status at the time of pregnancy.

  • 2-152 For SIDS cases breast feeding until time of death or over 3 months.

  • 2-153 Based on occupation at time of pregnancy studied according to the British registrar general's classification (I = professional, II = executive, III = skilled, IV = semi-skilled, V = unskilled). Housewives and students are classified under III.