The average vaccination differences from pre-intervention to the intervention year were significantly larger in the intervention arm ( n = @ practices ) than the control arm ( n = @ practices ) ; for children aged @-@ years ( @ pct pts intervention vs @ pct pts control , p < @ ) ; for non-white children ( @ pct pts intervention vs @ pct pts control , p < @ ) ; and overall ( @ pct pts intervention vs @ pct pts control , p < @ ) .