Validity and reliability of the Health Assessment Questionnaire among patients with spondyloarthritis in Singapore.

Aim: The Health Assessment Questionnaire (HAQ) is a popular tool used to measure disability. Few studies have assessed its psychometric properties in patients with spondyloarthritis (SpA). We therefore aimed to assess the reliability and validity of the HAQ in patients with SpA in Singapore.

Validity and reliability of the Short Form 36 Health Surveys (SF-36) among patients with spondyloarthritis in Singapore.

The Short Form 36 Health Survey (SF-36) is a popular health-related quality of life (HrQoL) tool. However, few studies have assessed its psychometric properties in patients with spondyloarthritis (SpA). We therefore aimed to assess the reliability and validity of the SF-36 in patients with SpA in Singapore.