Figure 1From: Adult depression screening in Saudi primary care: prevalence, instrument and cost Correlation between PHQ-2 & PHQ-9 scores. R = 0.79, R2 = 0.62, F Statistic = 780.5, p-value <0.001. Regression equation: PHQ-9 = 1.83 + 2.37 x PHQ-2.Back to article page