Table 4

 Adjusted matched odds ratios and population attributable fractions for infant feeding and sterilisation in all infants

CasesControlsOR† (95% CI)PAF
*In those not currently breast feeding.
†OR adjusted for age (as a continuous variable), sex, weaning, social class, travel, mixer, contact with person in household and outside household.
EBM, exclusive breast milk.
PAF, population attributable fraction.
Sterilisation of bottles*
    Chemical/steam138 (83%)105 (91%)1
    Boil/other29 (17%)10 (9%)3.42 (1.43 to 8.17)12%
p = 0.006
Infant feeding and sterilisation
    EBM11 (7%)23 (17%)1
    Mixed and chemicals/steam7 (4%)12 (9%)2.36 (0.55 to 10.10)2%
    Mixed and boil/other4 (2%)3 (2%)3.45 (0.55 to 21.55)1%
    Formula and chemicals/steam121 (73%)90 (67%)3.57 (1.39 to 9.15)53%
    Formula and boil/other23 (14%)7 (5%)14.04 (3.78 to 52.09)13%