Demographic-specific Validity of the Cancer Prevention Study-3 Sedentary Time Survey. Issue 1 (January 2019)

• Record Type: Journal Article
• Authors: REES-PUNIA, ERIKA; MATTHEWS, CHARLES E.; EVANS, ELLEN M.; KEADLE, SARAH K.; ANDERSON, REBECCA L.; GAY, JENNIFER L.; SCHMIDT, MICHAEL D.; GAPSTUR, SUSAN M.; PATEL, ALPA V.
• Is Part Of: Medicine and science in sports and exercise. Volume 51:Issue 1(2019)
• Publication Date: 2019-01
• Subjects: CPS-3 -- SITTING -- METHOD OF TRIADS -- VALIDATION -- RELIABILITY; Sports medicine -- Periodicals; Exercise -- Physiological aspects -- Periodicals; Exercise -- Health aspects -- Periodicals; 612.044
• DOI: 10.1249/MSS.0000000000001743
• Languages: English
• ISSNs: 0195-9131

Abstract

ABSTRACT: Purpose: This study examined the 1-yr test–retest reliability and criterion validity of sedentary time survey items in a subset of participants from a large, nationwide prospective cohort. Methods: Participants included 423 women and 290 men age 31 to 72 yr in the Cancer Prevention Study-3. Reliability was assessed by computing Spearman correlation coefficients between responses from prestudy and poststudy surveys. Validity was assessed by comparing survey-estimated sedentary time with a latent variable representing true sedentary time estimated from the 7-d diaries, accelerometry, and surveys through the method of triads. Sensitivity analyses were restricted to 566 participants with an average of 14+ h of diary and accelerometer data per day for 7 d per quarter. Results: Reliability estimates for total sitting time were moderate or strong across all demographic strata (Spearman ρ ≥ 0.6), with significant differences by race ( P = 0.01). Reliability estimates were strongest for the TV-related sedentary time item (Spearman ρ, 0.74; 95% confidence interval, 0.70–0.77). The overall validity coefficient (VC) for survey-assessed total sedentary time was 0.62 (95% confidence interval, 0.55–0.69), although VC varied by age group and activity level ( P < 0.05). However, VC were similar across groups ( P < 0.05) when restricting to highly compliant participants in a sensitivity analysis. Conclusions: The Cancer Prevention Study-3 sedentary behavior questionnaire has acceptable reliability and validity for ranking or categorizing participants according to sedentary time. Acceptable reliability and validity estimates persist across various demographic subgroups.