Characteristics of people lost to attrition in psychiatric follow-up studies

In a large (N = 1744) study of previously hospitalized psychiatric patients , multiple follow-up attempts were made to contact the ex-patients over a I -year period after their discharges. When contacted they were asked to prov ide information about their posthospital adjustment; 59.5% of the sample wa s reached at least once and usable data obtained either in a telephone inte rview or from a mailed survey form. The contacted and noncontacted people r epresented very different subpopulations, both demographically and in terms of typical psychiatric descriptors. Those who were of lower socioeconomic status, male, unmarried, racial minorities, and those with records of subst ance abuse or assaultiveness, and who were generally more severely impaired during the baseline hospitalization were underrepresented in the contacted group. Possible reasons for these sample biases, the implications for hosp itals conducting outcome assessments (i.e., for research and program evalua tion purposes), and strategies for dealing with this kind of methodological problem are discussed.