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Table 1 Sources of item identification of the included instruments (n = 104)1)

From: A comprehensive systematic review of the development process of 104 patient-reported outcomes (PROs) for physical activity in chronically ill and elderly people

Sources of item identification n %
Adaptation of existing scales only 18 17.3%
Patients & experts & literature (unsystematic search)1) 13 12.5%
Patients only 12 11.5%
Literature only (unsystematic search) 10 9.6%
Experts and literature (unsystematic search) 7 6.7%
Patients and literature (unsystematic search) 6 5.8%
Adaptation and literature (unsystematic search) 4 3.8%
Patients and experts 4 3.8%
Experts only 3 2.9%
Experts and adaptation and literature (unsystematic search) 2 1.9%
Patients and adaptation 2 1.9%
Adaptation and literature (systematic search) 1 1%
Adaptation and experts 1 1%
Patients and adaptation and literature (unsystematic search) 1 1%
Patients and experts and adaptation 1 1%
Significant others and literature (unsystematic search) and adaptation 1 1%
Not reported/not clearly described 18 17.3%
  1. 1) For data extraction details, please see Additional file 1