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Table 3 Outcome measures and their operationalisation

From: Effects of home visits by home nurses to elderly people with health problems: design of a randomised clinical trial in the Netherlands [ISRCTN92017183]

Outcome measure Operationalisation* Measurement**
Self-rated health*** report mark between 1–10 0, 1, 2, 3
Functional status*** GARS [28], score 18–72
Adl, subscore 11–44
Iadl, subscore 7–28
0, 1, 2, 3
Quality of life*** Rand-36 [29], 1item SF-20 [30], 2 subscales, score 0–100 0, 1, 2, 3
Changes in self-reported problems*** 3 main problems, 3-points scale 0, 1, 2, 3
Health complaints SCL-90 [31], 2 subscales 4
Depressive complaints GDS [23], score 0–15 4
Mental status MMSE-12 [32], score 0–12 4
Locus of control Mastery Scale [33], score 7–35 4
Social support SSL12-I [34], score 12–48 4
Loneliness Loneliness Scale [35], score 0–11 4
Medication volume, costs 4
Aids and modifications to the home type, costs 4, 5
Mortality number 5
Use of extramural and institutional care, e.g., medical specialist help*** and hospital (re-) admission*** e.g., number of contacts GPs, days in hospital, costs 5
  1. * the underlined scores indicate the most favourable score on the specific scale
  2. ** 0 = postal questionnaire at the start of the study
  3.      1 = postal questionnaire after 12 months
  4.      2 = postal questionnaire after 18 months (at the end of the intervention period)
  5.      3 = postal questionnaire after 24 months (at the end of a 6-months follow-up period)
  6.      4 = face-to-face interview after 18 months
  7.      5 = continuous registration by services over a 24-months period
  8. *** primary outcome measures