For one year Hays and her team followed 113 persons who were aged 60 years or older and were undergoing treatment for unipolar depression. About one-half of the subjects rated their overall health as fair or poor and had conditions such as heart trouble, cancer, or diabetes. All were assessed at the start of the study for depression severity; the amount of social support they were receiving, such as the size of their social network and the amount of social interaction they had; any instrumental support they were receiving, such as help with errands or transportation, or care during an illness; and their ability to perform various tasks of daily living, such as bathing, dressing, preparing meals, walking up and down stairs, and so forth. A year later the subjects were again assessed for their ability to perform various tasks of everyday life.