The average vaccination differences from pre-intervention to the intervention year were significantly larger in the intervention arm ( n = 10 practices ) than the control arm ( n = 10 practices ) ; for children aged 9-18 years ( 11.1 pct pts intervention vs 4.3 pct pts control , p < 0.05 ) ; for non-white children ( 16.7 pct pts intervention vs 4.6 pct pts control , p < 0.001 ) ; and overall ( 9.9 pct pts intervention vs 4.2 pct pts control , p < 0.01 ) .