Table 1

Accuracy of VA database for gout-related visits
True True False False Sensitivity Specificity PPV NPV Kappa
Positive Negative Positive Negative (95% CI) (95% CI) (95% CI) (95% CI) (95% CI)
(n/N) (n/N) (n/N) (n/N)
Main analyses (number = 85), including only patients with outpatient, inpatient, ER or Urgent care visits
All visits (number = 85) 18/85 61/85 3/85 3/85 0.86 0.95 0.86 0.95 0.81
(0.78, 0.93) (0.91, 1.00) (0.78, 0.93) (0.91, 1.00) (0.66, 0.96)
Outpatient visits only (number = 76) 16/76 55/76 3/76 2/76 0.89 0.95 0.84 0.96 0.82
(0.82, 0.96) (0.90, 0.99) (0.76, 0.92) (0.93, 1.00) (0.67, 0.97)
Inpatient, emergent or urgent care visits only (number = 9) 2/9 6/9 0/9 1/9 0.67 1.00 1.00 0.86 0.73
(0.57, 0.77) (N/A) (N/A) (0.78, 0.93) (0.24, 1.00)
Sensitivity analyses (number = 108), including all visits in databasea
All visits (number = 108) 19/108 79/108 6/108 4/108 0.83 0.93 0.76 0.95 0.73
(0.75, 0.90) (0.88, 0.98) (0.68, 0.84) (0.91, 0.99) (0.57, 0.89)
Outpatient visits only (number = 99) 17/99 73/99 6/99 3/99 0.85 0.92 0.74 0.96 0.73
(0.78, 0.92) (0.87, 0.97) (0.66, 0.82) (0.92, 1.00) (0.57, 0.90)
Inpatient, emergent or urgent care visits only (number = 9) 2/9 6/9 0/9 1/9 0.67 1.00 1.00 0.86 0.73
(0.57, 0.77) (N/A) (N/A) (0.78, 0.93) (0.24, 1.00)

aThese included telephone and laboratory visits as well as those for which there was no documentation in the medical records. 95% CI, 95% confidence interval; N/A, not applicable; NPV, negative predictive value; PPV, positive predictive value;

Singh

Singh Arthritis Research & Therapy 2013 15:R224   doi:10.1186/ar4425

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