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Table 5 Apparent prevalence (diagnosis in the CCR), true prevalence (fulfillment of the diagnosis criteria) and predictive values of diabetes and hypertension.

From: Validation of diabetes mellitus and hypertension diagnosis in computerized medical records in primary health care

  Apparent prevalence * (CI 95%) True prevalence ** (CI 95%) PPV (CI 95%) NPV (CI 95%)
Diabetes 5.02 (4.96 - 5.07) 5.06 (5.01 - 5.12) 91.23 (72.30 - 97.64) 99.98 (99.90 - 99.99)
- Male 5.61 (5.53 - 5.70) 5.67 (5.58 - 5.75) 92.59 (63.89 - 98.88) 99.97 (99.80 - 100)
- Female 4.55 (4.48 - 4.62) 4.59 (4.52 - 4.66) 91.11(59.19 - 98.64) 99.98 (99.84 - 100)
- Age < 70 2.89 (2.84 - 2.93) 2.91 (2.87 - 2.96) 85.58 (45.66 - 97.67) 99.99 (99.90 - 100)
- Age ≥ 70 15.72 (15.50 - 15.94) 15.87 (15.65 - 16.09) 97.32(83.69 - 99.61) 99.91 (99.38 - 99.99)
Hypertension 14.11 (14.03 - 14.20) 17.14 (17.05 - 17.23) 85.24 (74.46 - 91.96) 96.94 (96.24 - 97.52)
- Male 13.31 (13.18 - 13.43) 16.27 (16.13 - 16.41) 85.84 (66.47 - 94.88) 96.96 (95.87 - 97.78)
- Female 14.75 (14.63 - 14.86) 17.82 (17.70 - 17.95) 84.90 (70.34 - 93.02) 96.93 (95.94 - 97.68)
- Age < 70 7.75 (7.68 - 7.82) 8.91 (8.84 - 8.99) 68.72 (48.18 - 83.85) 99.05 (98.53 - 99.39)
- Age ≥ 70 46.07 (45.77 - 46.36) 57.86 (57.56 - 58.15) 98.10 (94.40 - 99.37) 79.61 (75.40 - 83.27)
- Without DM 11.66 (11.58 - 11.74) 13.81 (13.72 - 13.89) 82.52 (69.44 - 90.74) 97.94 (97.32 - 98.42)
- With DM 60.60 (60.07 - 61.14) 80.22 (79.78 - 80.65) 98.68 (91.62 - 99.80) 53.92 (45.09 - 62.52)
  1. PPV: positive predictive value; NPV: negative predictive value; CI 95%: confidence interval at 95%.