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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%)