The<unk>  (ASQoL) questionnaire is a patient-reported outcome (PRO) measure which assesses the quality of<unk>  of patients with<unk><unk> . The ASQoL is based on the needs-based quality of<unk>  model. It is a self-administered questionnaire which contains 18 items and takes up to four minutes to complete. Developed by Galen Research and published in 2003, the ASQoL has been used in clinical studies worldwide. The content for the measure was drawn from qualitative interviews that were conducted with<unk><unk>  (AS) patients. The draft version of the ASQoL was created and then went through several stages of testing to ensure it had good face validity, content validity, reproducibility and construct validity.
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