Comparison data for primary care physicians' frequency of recommendations for low back pain management.

Response categories were collapsed from four categories into two groups: ‘Never’ and ‘at least once per week’. Only subjects who completed both baseline and follow-up surveys are included in the post-intervention columns of the table. The kappa statistic assessed the degree of change in response (kappa over 0.75 indicates little change, while a low value of kappa indicates that a change has occurred). * kappa cannot be calculated because no respondent marked a ‘Never’ response post-intervention.