Descriptive statistics for confounding variables for each study year
| Variable | Year; mean ± SD* | |||||||
|---|---|---|---|---|---|---|---|---|
| 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | |
| No. of physicians with a panel | 86 | 93 | 119 | 119 | 130 | 152 | 154 | 153 |
| No. of physicians excluded (< 13 TNA measures within the year) | 5 | 2 | 22 | 3 | 16 | 38 | 28 | 20 |
| No. of physicians included in analysis | 81 | 91 | 97 | 116 | 114 | 114 | 126 | 133 |
| Confounding variables | ||||||||
| Practice characteristics | ||||||||
| No. of physicians | 81 | 91 | 97 | 116 | 114 | 114 | 126 | 133 |
| No. of clinics | 17 | 18 | 19 | 24 | 23 | 21 | 22 | 23 |
| Female physicians, no. (%) | 21 (25.9) | 27 (29.7) | 30 (30.9) | 33 (28.4) | 37 (32.5) | 32 (28.1) | 39 (31.0) | 40 (30.1) |
| Rural physicians, no. (%) | 47 (58.0) | 51 (56.0) | 53 (54.6) | 54 (46.6) | 53 (46.5) | 57 (50.0) | 58 (46.0) | 65 (48.9) |
| No. of days worked per week | 4.0 ± 1.5 | 4.0 ± 1.5 | 3.9 ± 1.5 | 4.0 ± 1.5 | 4.0 ± 1.4 | 4.1 ± 1.3 | 4.0 ± 1.4 | 3.9 ± 1.4 |
| No. of physicians per clinic | 7.1 ± 3.4 | 7.3 ± 3.6 | 8.2 ± 4.5 | 8.7 ± 4.1 | 7.9 ± 3.9 | 9.5 ± 5.0 | 8.4 ± 3.5 | 7.9 ± 3.4 |
| Panel characteristics | ||||||||
| No. of panelled patients | 110 868 | 114 531 | 108 244 | 151 866 | 157 631 | 158 974 | 164 965 | 169 563 |
| Physician panel size | 1458.8 ± 779 | 1286.9 ± 742 | 1127.5 ± 674 | 1368.2 ± 928 | 1382.7 ± 832 | 1406.8 ± 845 | 1330.4 ± 829 | 1367.4 ± 806 |
| Age of patients, yr | 39.6 ± 6.8 | 40.1 ± 7.2 | 40.4 ± 7.3 | 40.3 ± 6.8 | 40.1 ± 6.5 | 40.0 ± 6.1 | 39.1 ± 5.8 | 39.2 ± 6.0 |
| Patients on multiple panels, % | 13.9 ± 6.9 | 13.4 ± 7.7 | 14.1 ± 10.9 | 12.5 ± 7.1 | 14.0 ± 7.5 | 11.5 ± 5.9 | 12.0 ± 8.9 | 11.4 ± 8.3 |
| Complex patients, % | 5.2 ± 1.8 | 5.0 ± 1.7 | 5.6 ± 1.8 | 5.3 ± 1.7 | 4.8 ± 1.9 | 5.1 ± 1.7 | 5.3 ± 1.8 | 6.0 ± 2.0 |
| Female patients, % | 55.2 ± 13.5 | 55.5 ± 13.8 | 55.2 ± 14.4 | 55.3 ± 13.4 | 54.2 ± 13.2 | 53.5 ± 12.6 | 53.6 ± 12.4 | 53.1 ± 11.9 |
| Patients aged > 60 yr, % | 21.3 ± 9.7 | 22.4 ± 10.5 | 22.4 ± 10.8 | 23.5 ± 10.3 | 23.1 ± 10.0 | 22.7 ± 9.4 | 22.3 ± 8.8 | 22.9 ± 9.4 |
Note: SD = standard deviation, TNA = third next available appointment.
↵* Except where noted otherwise.