Test; specialty | Durbin-Watson statistic | Estimate (95% CI) | ||
---|---|---|---|---|
Time (overall secular trend) | Effect of intervention | Postintervention slope | ||
Lumbar spine radiography | ||||
Family physician | 2.204 | -0.006 (-0.0119 to 0.0001) | -0.813 (-0.9883 to 0.6377) | 0.0096 (0.0036 to 0.0157) |
Specialist | 2.522 | -0.0019 (-0.0043 to 0.0005) | -0.003 (-0.0757 to 0.0697) | 0.0011 (-0.0018 to 0.0039) |
Limited spine MRI | ||||
Family physician | 2.231 | 0.0067 (0.0051 to 0.0083) | -0.175 (-0.2221 to -0.1279) | 0.0034 (0.0018 to 0.0051) |
Specialist | 2.294 | 0.0009 (-0.0011 to 0.0029) | -0.102 (-0.1603 to 0.0437) | 0.0022 (0.0004 to 0.0041) |
Spine CT | ||||
Family physician | 1.584 | -0.0028 (-0.0039 to -0.0017) | -0.099 (-0.1230 to -0.0750) | 0.0001 (-0.0012 to 0.0014) |
Specialist | 2.091 | -0.0012 (-0.0019 to 0.0005) | -0.010 (-0.0316 to 0.0116) | 0.0014 (0.0001 to 0.0028) |
Note: CI = confidence interval, CT = computed tomography, MRI = magnetic resonance imaging.