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Table 1 Characteristics of the participating GPs

From: Educational outreach visits to improve knee osteoarthritis management in primary care

Variable Statistic Intervention Control ¥ Total P-value
N 73 103 176
Age (yrs)
  Mean 44.4 41.0 42.4 0.131
Std 14.35 12.57 13.40  
Gender
 Female n/N (%) 28/73 (38.36%) 58/103 (56.31%) 86/176 (48.86%) 0.019
 Male n/N (%) 45/73 (61.64%) 45/103 (43.69%) 90/176 (51.14%)  
Practice type
 Solo practice n/N (%) 30/73 (41.10%) 19/103 (18.45%) 49/176 (27.84%) 0.002
 Duo practice n/N (%) 16/73 (21.92%) 22/103 (21.36%) 38/176 (21.59%)  
 Group practice n/N (%) 27/73 (36.99%) 62/103 (60.19%) 89/176 (50.57%)
Years of experience
  Mean 18.2 14.4 16.0 0.107
Std 14.23 12.25 13.20  
Questionnaire received
 By letter n/N (%) 11/73 (15.07%) 25/103 (24.27%) 36/176 (20.45%) 0.136
 By mail n/N (%) 62/73 (84.93%) 78/103 (75.73%) 140/176 (79.55%)  
  1. Variables presented with percentages are analysed using a Chi-square test
  2. Variables summarized by means, medians, Std, IQR and Range are analysed using a Mann-Whitney U test
  3. All reported p-values are two-sided
  4. ¥ Case number 45 in the control group was excluded from this analysis because data on patient characteristics were missing