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Table 1 Sampling frame and procedures in each country participating in the MentDis_ICF65+ study

From: Study approach and field work procedures of the MentDis_ICF65+ project on the prevalence of mental disorders in the older adult European population

  Hamburg (Germany) Ferrara (Italy) London (England) Madrid (Spain) Geneva (Switzerland) Jerusalem (Israel)
Sample frame Registries of resident registration offices in the metropolitan area of Hamburg through a market research company Registries of resident registration offices in Ferrara and the province Post office address files in Greenwich Borough and Canterbury District through a market research company Addresses of residents in Madrid from the Statistical Institute of Madrid, a private company, and the Madrid City Council Addresses of residents in the Geneva canton through a marketing company Addresses of Jewish residents in the greater Jerusalem area through a market research company
Stage 1 Stratification by age and gender Stratification by age and gender Stratification by age and gender Stratification by age and gender Stratification by age, gender, socio-economic status, city/rural location Stratification by age and gender
Stage 2 random selection from a registry of 5640 participants random selection from registry
- 1st selection: 2000 participants
- 2nd selection: 1918 participants
- 3rd selection: 720 participants
random selection from files
- 1st selection: 2977 participants
- 2nd selection: 1145 participants
random selection from a census of 1072 participants (Madrid administration) and 1063 from files (private company) random selection from registry
- 1st selection: 2000 participants
- 2nd selection: 700 participants
random selection
- 1st selection: 2500 participants
- 2nd selection: 708 participants