Table 1 Characteristics of studied samples
Study | Development STUDY | Study 1 | Study 2 | Study 3 |
|---|---|---|---|---|
Organization, Location | DOXA, MILAN | DOXA, MILAN | CATHOLIC UNIVERSITY, MILAN | UNIVERSITY HOSPITAL SACCO,MILAN |
Year | 2000 | 2004 | 2004 | 2004 |
# cases | 1129 | 1015 | 400 | 28 |
Questionnaire administered | PGWBI | PGWB-S | PGWBI, PGWB-S | PGWBI, PGWB-S |
Sampling method | random | random | random | random |
Population | General population | General population | University students, in second year of Psychology and others | In-patients with diagnosis of chronic inflammatory bowel disease |
Mode of administration | Person-to-person* | Person-to-person* | Self-administered** | Self-administered** |
Male % | 48.1 | 49.5 | 11.4 | 39.3 |
Age, mean yrs | 47.4 | 51.3 | 21.5 | 50.1 |