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Content validity index analysis of the European Health Literacy Survey Questionnaire 16 (HLS-EU-Q16).
| Panel | Mean I-CVIa | S-CVI/Aveb | S-CVI/UAc |
| Group of experts (N=6) | .96 | .96 | .81 |
| Group of health professionals (N=20) | .97 | .97 | .69 |
| Total | .93 | .97 | .63 |
aI-CVI: item-level content validity index.
bS-CVI/Ave: single-level content validity index/average.
cS-CVI/UA: single-level content validity index/universal agreement.
