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Table 2 Contacting the sample 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)
Total number of contacted people (N) 5640 3213 2534 3375 2700 3208
Total number of people who agreed to participate (n, %) 626 (11.1) 546 (17.0) 542 (21.4) 584 (17.3) 565 (20.9) 609 (18.9)
Excluded participants (n) 13 23 10 3 4 60
Reasons for exclusion cognitive problems cognitive problems cognitive problems cognitive problems cognitive problems cognitive and language problems
Drop out (not required)a 106 (54) 0 36 26 41 7
Reasons for dropping out Withdrawal of willingness to participate, illness, not reached, not required, invalid interview (incomplete data) Denial or subsequent withdrawal of willingness to participate, illness, not reached, deceased, transferred, not required Withdrawal of willingness to participate, illness, not reached, invalid interview (incomplete data) Withdrawal of willingness to participate, not reached, illness, invalid interview (incomplete data) Illness, holidays, difficulty locating, invalid interview (incomplete data) Withdrawal of willingness to participate, illness
Incentives 25 Euro shopping voucher A small gift none 15 Euro shopping voucher None, except for a choice of interview location (home/office) a small gift
Final sample size (N) 510 524 496 555 520 542
  1. aIn Hamburg, n = 54 people had agreed to participate but were not contacted for an interview because the total sample size and the sample size in each stratum (age and gender groups) had been reached. They are listed as “not required”