The stability of utility scores: Test–retest reliability and the interpretation of utility scores in elective total hip arthroplasty

Purposes: Are utility scores for hypothetical health states stable over time even when the health of the patient changes dramatically? Can investigators who use scores for hypothetical states be confident about the stability of those scores? The first purpose is to assess the stability of standard gamble utility scores for three hypothetical health states describing mild, moderate, and severe osteoarthritis (OA) (test–retest reliability). How …