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Table 4 Serial analysis as a proxy measurement of treatment adherence with pill count as gold standard.

From: Performance of two questionnaires to measure treatment adherence in patients with Type-2 Diabetes

SERIAL ANALYSIS TREATMENT ADHERENCE  
  Good Poor  
Good 45 67 112
Poor 65 230 295
  110 297 407
  1. Sensitivity (95% CI): 40.9% (31.6–50.6)
  2. Specificity (95% CI): 77.4% (72.2–82.0)
  3. Positive predictive value (95% CI): 40.1% (31.0–49.8)
  4. Negative predictive value (95% CI): 77.9% (72.8–82.5)
  5. Positive likelihood ratio (95% CI): 1.8 (1.33–2.47)
  6. Negative likelihood ratio (95% CI): 0.76 (0.65–0.90)
  7. Pre-test odds (95% CI): 0.36 (0.28–0.44)
  8. Positive post-test odds (95% CI): 0.64 (0.37–1.08)
  9. Positive post-test probability (95% CI): 0.39 (0.27–0.51)
  10. Negative post-test odds (95% CI): 0.27 (0.18–0.39)
  11. Negative post-test probability (95% CI): 0.21 (0.15–0.28)