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. Author manuscript; available in PMC: 2019 Jul 1.
Published in final edited form as: J Hand Surg Am. 2018 May 31;43(7):606–614.e1. doi: 10.1016/j.jhsa.2018.04.015

Table 4.

Univariate Analysis for the Effect of Injury-Specific Factors on Total Direct Costs

Factor Relative Costa P - Value
Coefficient 95% Confidence Interval
Acute carpal tunnel syndrome treated with carpal tunnel release
 No Reference Category - -
 Yes 0.90 (0.71 • 1.13) 0.36
Distal radius number of articular partsb -
 1 Reference Category - -
 2 0.88 (0.77 • 1.01) 0.07
 ≥3 0.94 (0.84 • 1.06) 0.32
Distal ulna fracture requiring surgical treatmentc
 No Reference Category -
 Yes 1.11 (0.91 • 1.34) 0.28
Open Fracture
 No Reference Category - -
 Yes 1.55 (1.23 • 1.96) < 0.05
a

Relative Cost (RC): Gamma univariate regression coefficients (eβ). For example, a value of 1.6 is interpereted as a 60% increase in total direct costs as compared to the reference category. Bolded p-values were determined to be statistically-significant.

b

Based upon CPT codes.

c

CPT codes include those for treatment of concomittant ulnar fractures (Darrach, or ORIF of the distal ulna or ulnar styloid).