• chronic respiratory failure (CRF);
  • health-related quality of life (HRQOL);
  • long-term mechanical ventilation (LTMV);
  • the Severe Respiratory Insufficiency (SRI) questionnaire;
  • validation study

The aims of this study were to translate and adapt the Severe Respiratory Insufficiency (SRI) questionnaire into Norwegians and to test its reliability and validity.Data were collected from a cross-sectional survey and were linked to the Norwegian Registry of patients receiving long-term mechanical ventilation (LTMV). Of 193 potential participants, 127 responded to the SRI questionnaire. Reliability as measured with Cronbach's α varied between 0.68 and 0.88 for the subscales and was 0.94 for SRI-sum score. Construct validity was obtained with high correlations between subscales in SF-36 and SRI. The SRI questionnaire discriminated well between universally accepted clinical differences among categories of patients receiving LTMV by significant dissimilarities in SRI-sum score and SRI subscales. The Norwegian version of SRI has well-documented psychometric properties regarding reliability and validity. It might be used in clinical practice and in international studies for assessing health-related quality of life in patients receiving LTMV.