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Table 1 Characteristics of studied samples

From: Development and validation of the short version of the Psychological General Well-Being Index (PGWB-S)

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
  1. * Self-administration in a structured interview
  2. ** Self-administration of both questionnaires one hour apart (cross-over design)