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Effect of a 1-month vs. a 12-month reference period on responses to the 14-item Oral Health Impact Profile

Lookup NU author(s): Emeritus Professor Jimmy Steele CBE, Patrick Allen


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The length of the reference period used in surveys of subjective oral health may have a marked influence on the responses obtained. We aimed to evaluate the effect of a 1-month (RP-1) vs. a 12-month (RP-12) reference period in the Oral Health Impact Profile (OHIP-14) questionnaire. Using a randomized cross-over design, RP-1 and RP-12 OHIP-14 questionnaires were administered, 1 month apart, to two samples of Finnish adults, namely people awaiting orthognathic surgery (n = 104) and non-patient workers (n = 111). The effect of the reference period was computed by subtracting RP-1 OHIP-14 severity scores from RP-12 OHIP-14 severity scores (ΔRP). Potential order effects were assessed by comparing ΔRP between groups completing the RP-1 vs. the RP-12 questionnaire first. Mean OHIP-14 severity scores were slightly higher when the RP-12 questionnaire was administered first, but mean ΔRP values were below the value of 2.5 considered clinically meaningful, and all 95% confidence intervals for ΔRP included zero. No order effects in the OHIP-14 severity scores were observed. Therefore, although a standardized reference period of 12 months is recommended, in population surveys the use of a shorter reference period does not appear to influence responses. © 2007 Eur J Oral Sci.

Publication metadata

Author(s): Sutinen S, Lahti S, Nuttall NM, Sanders AE, Steele JG, Allen PF, Slade GD

Publication type: Note

Publication status: Published

Journal: European Journal of Oral Sciences

Year: 2007

Volume: 115

Issue: 3

Pages: 246-249

ISSN (print): 0909-8836

ISSN (electronic): 1600-0722


DOI: 10.1111/j.1600-0722.2007.00442.x

PubMed id: 17587301