Subject Characteristics A total of # subjects participated in the study, with # subjects providing complete data at both pretest and at the 6-month follow-up visit. All data included in the dataset were scrutinized for data entry errors or nonsensical responses. Data cleaning was accomplished by . A total of = errors were detected In order to test the effectiveness of the random assignment procedure, the demographic characteristics and baseline characteristics of the intervention and control groups were compared (see Table 1).