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Mean (95% CI) weight-for-age and height-for-age Z scores (relative to NCHS values) for children up to age 1 year from cohort 1. Children are divided into three groups: those with consecutive positive urea breath tests from age 3 months; those with consecutive negative breath tests throughout infancy; and the remaining children with mixed results. Children in the first cohort were studied at 12 week intervals.
