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Table 3 Regression models of chiropractors’ productivity measures

From: Characteristics and productivity of the chiropractic workforce of the Veterans Health Administration

Variable Univariable Mutivariable
  95% CI    95% CI  
Coefficient LCI UCI P Coefficient LCI UCI P
Age group (ref: < 40)      < 0.001     0.1
 40–49 262.43 −201.60 726.45 0.27 37.12 −427.65 501.89 0.87
 50–59 546.73 45.18 1048.27 0.03 324.49 −199.34 848.32 0.22
 60 +  1107.33 562.87 1651.79  < 0.001 657.29 86.09 1228.49 0.02
Sex
 Male vs. Female 248.41 −205.94 702.77 0.28 57.75 −383.47 498.98 0.80
Years served in VHA
  52.05 14.64 89.45 0.01 13.85 −26.36 54.06 0.50
Number of unique patients
  1.90 1.17 2.62  < 0.001 0.59 −0.71 1.89 0.37
Patient visits
  0.50 0.32 0.68  < 0.001 0.29 −0.03 0.61 0.07
Number of DCs per facility (ref: DC = 1)     0.11     0.13
2 531.42 9.06 1053.79 0.05 60.85 −457.96 579.66 0.82
3 654.38 33.61 1275.15 0.04 608.73 28.98 1188.48 0.04
3+  240.62 −332.30 813.55 0.41 49.33 −537.24 635.90 0.87
Administrative support staff FTE per DC FTE
  184.68 −374.47 743.82 0.52     
Clinical support staff FTE per DC FTE
  391.42 −380.26 1163.10 0.32     
MCG (ref = 1a-High Complexity)     0.18     0.4
MCG1b-High Complexity −390.61 −927.17 145.96 0.15 −351.14 −872.80 170.52 0.19
MCG1c-High Complexity −254.05 −779.45 271.35 0.34 −152.69 −709.36 403.99 0.59
MCG2-Medium Complexity −427.83 −1058.51 202.85 0.18 −168.56 −794.08 456.95 0.60
MCG3-Low Complexity −706.02 −1303.43 −108.60 0.02 −580.36 −1221.04 60.32 0.08
  1. CI confidence interval, LCI lower confidence interval, UCI upper confidence interval, VHA Veterans Health Administration, DC doctor of chiropractic, FTE full-time equivalent, MCG medical complexity grouping