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  • Title: Response-shift bias and parent-reported quality of life in children with otitis media.
    Author: Timmerman AA, Anteunis LJ, Meesters CM.
    Journal: Arch Otolaryngol Head Neck Surg; 2003 Sep; 129(9):987-91. PubMed ID: 12975273.
    Abstract:
    OBJECTIVES: To validate the 6-item quality-of-life survey (OM-6) and to investigate response-shift bias regarding children with otitis media. SETTING: Otorhinolaryngology department of a university hospital that serves the southernmost part of the Netherlands. PATIENTS: Seventy-seven children (age range, 12-38 months) experiencing persistent otitis media with effusion and scheduled for placement of tympanostomy tubes. SURVEY: The OM-6 measures health-related quality of life in 6 domains: physical suffering, hearing loss, speech impairment, emotional distress, activity limitations, and caregiver concerns. INTERVENTION: Parents completed the OM-6 before surgery (pretest) and 6 weeks after surgery (posttest). At the posttest, parents also completed a retrospective version of the pretest (retrospective pretest). RESULTS: For most items, the test-retest reliability was good (R>0.8). The internal consistency of the OM-6 was satisfactory (alpha =.79). The construct validity, determined by correlating the ear-related global quality-of-life measure and the OM-6 summary score, was fair (R = -0.77, P<.01). Prospective change in quality of life on the OM-6 ranged from moderate (standardized response mean >/=0.5) to large (standardized response mean >/=0.8). Response-shift bias was present at the group level (t = -3.3, P<.01). Retrospective change was significant for hearing loss (z = -3.3, P<.05) and ear-related global quality of life (z = -3.6, P<.05). CONCLUSIONS: The validity of the OM-6 has been proved in a Dutch population. The data suggest that parents underestimate the seriousness of hearing loss and overestimate the quality of life of their child before surgery, indicating a response shift. Treatment results could lead parents to realize that the situation before surgery had been worse than they thought.
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