Seventy-fivepercent of the individuals who scored highon the adherence scale at baseline had theirblood pressure under control at 42 months, compared with only 47% of those scoringmedium or low, respectively (Fig. 1). In otherwords, a 5-percentage-point improvement inblood pressure control was noted for personsscoring low on the self-reported medicationadherence scale between 6 and 42 months,while for individuals scoring high, a 21-percentage-point increase was observed. Apaired t-test between groups using diastolicblood pressure as the criterion revealed statistically significant differences as well (t= 6.43; P < 0.01). To assess the strength ofthe relationship between the self-reportedmedication-taking scale and blood pressure control measure, the coefficient of determination (R2) was used. This coefficient wasalso found to be significant (R2 = 0.33; P