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Table 1 Physician characteristics associated with accuracy of syndrome definitions based on physician claims (OR >1.00 means the encounter characteristic increased the PPV of the syndrome definition, OR < 1.00 means the encounter characteristic reduced the PPV)

From: Patient, physician, encounter, and billing characteristics predict the accuracy of syndromic surveillance case definitions

  No. visits with a syndrome-positive physician claim Bivariate regression analysis Multivariate regression analysis1
Physician characteristics Syndrome-positive in the chart
(N = 2,967)
Syndrome-negative in the chart
(N = 1,363)
Total
(N = 4,330)
OR 95% CI P value OR 95% CI P value
  No. % No. % No. %       
Gender:             
   Female 1,164 39.2 523 38.4 1,687 39.0 Ref. Ref. Ref. Ref. Ref. Ref.
   Male 1,803 60.8 840 61.6 2,643 61.0 0.97 (0.83, 1.12) 0.64 1.13 (0.96, 1.33) 0.13
Preferred language:             
   French 2,743 92.5 1,253 91.9 3,996 92.3 Ref. Ref. Ref. Ref. Ref. Ref.
   English 224 7.5 110 8.1 334 7.7 0.93 (0.69, 1.25) 0.63 0.94 (0.69, 1.26) 0.66
Specialty:             
   General practice 2,721 91.7 1,246 91.4 3,967 91.6 Ref. Ref. Ref. Ref. Ref. Ref.
   Pediatrics 203 6.8 75 5.5 278 6.4 1.24 (0.88, 1.77) 0.22 0.83 (0.57, 1.20) 0.33
   Internal medicine or general surgery 43 1.5 42 3.1 85 2.0 0.46 (0.31, 0.69) < 0.001 0.59 (0.35, 0.98) 0.04
  Mean SD Mean SD Mean SD       
Years since licensure (per 5 years) 22.9 9.2 23.7 9.6 23.1 9.4 0.95 (0.92, 0.99) 0.02 0.96 (0.92, 1.00) 0.04
  1. 1 Multivariate analysis adjusted for all physician characteristics in Table 1, all patient characteristics in Table 2, and all encounter characteristics in Table 3.