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Table 3 Comparability of practitioners and practices

From: Educational outreach to general practitioners reduces children's asthma symptoms: a cluster randomised controlled trial

  Intervention Control p-value
  (21 practices) (22 practices)  
Up to 10 years since physician registered 9 1 0.1*
11–20 years since registration 11 9  
More than 20 years since registration 12 13  
Male physicians 24 21 0.17
Female physicians 8 2  
0 – 5 children with asthma in practice 12 14 0.76
>5 children with asthma in practice 9 8  
  1. *Chi square = 5.3
  2. Fisher's exact test