Survival curves of time to recurrence of elderly depressed patients who experience 0, 4, 8, and 12 weeks of subsyndromal symptoms during the first 6 months following remission. The survival curves start 6 months after remission (0 days) and end 2 years later. Calculated by the Proportional Hazards Model: “Duration Subsyndromal Symptoms” associated with time to recurrence. Proportional Hazards Likelihood Ratio for the overall model: χ2==13.74, df=1, p<0.0002; for Duration Subsyndromal Symptoms: χ2=18.28, df=1, p=<.0001.