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Table 1 Studies using multi-language Delphi surveys in the development of international COS

From: Methods for conducting international Delphi surveys to optimise global participation in core outcome set development: a case study in gastric cancer informed by a comprehensive literature review

Condition/group Original language Target language(s) Total participants in surveys Total participants using translated survey(s) (%)
Hip and knee osteoarthritis
OMERACT-OARSI [9]
English Italian and Spanish 426 2 (0.5%)
Medication review in multi-morbid older patients with polypharmacy
OPERAM [10]
French Dutch, German, English 150 118 (79%)
Idiopathic inflammatory myopathy
OMERACT [11]
English Swedish, Dutch and Korean 500 120 (24%)
Vascular malformations
OVAMA Group [12]
English Dutch 301 72 (24%)
Gastric cancer
GASTROS study
English Chinese, Dutch, German, Italian, Portuguese, Spanish, Turkish 952 637 (66%)