Table 1

Mean (SD) WISC-R IQ scores by duration of breast milk feeding

MeasureDuration of breast milk feedingr Valuep Value
Not breast fed (n=76)<4 months (n=99)4–7 months (n=46)8+ months (n=59)
Verbal IQ94.4 (18.4)97.2 (18.4)101.7 (17.3)104.6 (14.7)0.21<0.001
Performance IQ98.7 (19.6)101.4 (15.6)101.1 (14.0)104.9 (15.3)0.12<0.05
  • WISC-R, revised Wechsler intelligence scale for children.