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Table 2 Medical prescription knowledge 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

MEDICAL PRESCRIPTION KNOWLEDGE TREATMENT ADHERENCE  
  Good Poor  
Strong 75 135 210
Weak 35 162 197
  110 297 407
  1. Sensitivity (95% CI): 68.1% (58.6–76.7)
  2. Specificity (95% CI): 54.5% (48.6–60.3)
  3. Positive predictive value (95% CI): 35.7% (29.2–42.6)
  4. Negative predictive value (95% CI): 82.2% (76.1–87.3)
  5. Positive likelihood ratio (95% CI): 1.50 (1.25–1.79)
  6. Negative likelihood ratio (95% CI): 0.58 (0.44–0.78)
  7. Pre-test odds (95% CI): 0.36 (0.28–0.44)
  8. Positive post-test odds (95% CI): 0.54 (0.35–0.78)
  9. Positive post-test probability (95% CI): 0.35 (0.25–0.43)
  10. Negative post-test odds (95% CI): 0.20 (0.12–0.34)
  11. Negative post-test probability (95% CI): 0.16 (0.10–0.25)