Table 4.

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

SERIAL ANALYSIS	TREATMENT ADHERENCE
	Good	Poor
Good	45	67	112
Poor	65	230	295
	110	297	407

Sensitivity (95% CI): 40.9% (31.6–50.6)

Specificity (95% CI): 77.4% (72.2–82.0)

Positive predictive value (95% CI): 40.1% (31.0–49.8)

Negative predictive value (95% CI): 77.9% (72.8–82.5)

Positive likelihood ratio (95% CI): 1.8 (1.33–2.47)

Negative likelihood ratio (95% CI): 0.76 (0.65–0.90)

Pre-test odds (95% CI): 0.36 (0.28–0.44)

Positive post-test odds (95% CI): 0.64 (0.37–1.08)

Positive post-test probability (95% CI): 0.39 (0.27–0.51)

Negative post-test odds (95% CI): 0.27 (0.18–0.39)

Negative post-test probability (95% CI): 0.21 (0.15–0.28)