Article

Test-Retest Reliability of the Women's Health Initiative Physical Activity Questionnaire

Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Medicine and science in sports and exercise (Impact Factor: 4.46). 03/2009; 41(3):530-8. DOI: 10.1249/MSS.0b013e31818ace55
Source: PubMed

ABSTRACT Few physical activity (PA) questionnaires were designed to measure the lifestyles and activities of women. We sought to examine the test-retest reliability of a PA questionnaire used in the Women's Health Initiative (WHI) study. Differences in reliability were also explored by important covariates.
Participants (n = 1092) were postmenopausal women aged 50-79 yr, randomly selected from the baseline sample of participants in the WHI Observational Study. The WHI PA questionnaire collects usual frequency, duration, and pace of recreational walking, frequency, and duration of other recreational activities or exercises (mild, moderate, and strenuous), household, and yard activities. Approximately half of the women (n = 569) repeated questions on recreational PA, the other half (n = 523) repeated questions related to household and yard activities (mean 3 months apart). Test-retest reliability was assessed with kappa and intraclass correlation coefficients (ICC 1,1).
Overall, questions on recreational walking, moderate recreational PA, and strenuous recreational PA had higher test-retest reliability (weighted kappa range = 0.50-0.60) than questions on mild recreational PA (weighted kappa range = 0.35-0.50). The ICC 1,1 for moderate to strenuous recreational PA was 0.77 (95% confidence interval [CI] = 0.73-0.80), and the total recreational PA was 0.76 (95% CI = 0.71-0.79). Substantial reliability was observed for the summary measures of yard activities (ICC 1,1 = 0.71; 95% CI = 0.66-0.75) and household activities (ICC 1,1 = 0.60, 95% CI = 0.55-0.66). No meaningful differences were observed by race/ethnicity, age, time between test and retest, and amount of reported PA.
The WHI PA questionnaire demonstrated moderate to substantial test-retest reliability in a diverse sample of postmenopausal women.

Download full-text

Full-text

Available from: Anne-Marie Meyer, Oct 29, 2014
0 Followers
 · 
95 Views
    • "Walking and total physical activity was assessed using a validated selfreported questionnaire (Meyer et al., 2009; Pettee Gabriel et al., 2009) with data collection detailed elsewhere (Nguyen et al., 2013). A summary variable was calculated for walking (min/wk) including all walking intensities. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Positive associations between dog ownership and physical activity in older adults have been previously reported. The objective of this study was to examine cross-sectional associations between dog ownership and physical activity measures in a well-characterized, diverse sample of postmenopausal women. Analyses included 36,984 dog owners (mean age: 61.5years), and 115,645 non-dog owners (mean age: 63.9years) enrolled in a clinical trial or the observational study of the Women's Health Initiative between 1993 and 1998. Logistic regression models were used to test for associations between dog ownership and physical activity, adjusted for potential confounders. Owning a dog was associated with a higher likelihood of walking ≥150min/wk (Odds Ratio, 1.14; 95% Confidence Interval, 1.10-1.17) and a lower likelihood of being sedentary ≥8h/day (Odds Ratio, 0.86; 95% Confidence Interval, 0.83-0.89) as compared to not owning a dog. However, dog owners were less likely to meet ≥7.5MET-h/wk of total physical activity as compared to non-dog owners (Odds Ratio, 1.03; 95% Confidence Interval, 1.00-1.07). Dog ownership is associated with increased physical activity in older women, particularly among women living alone. Health promotion efforts aimed at older adults should highlight the benefits of regular dog walking for both dog owners and non-dog owners. Copyright © 2014 Elsevier Inc. All rights reserved.
    Preventive Medicine 11/2014; 70C:33-38. DOI:10.1016/j.ypmed.2014.10.030 · 2.93 Impact Factor
  • Source
    • "Physical activity questionnaire testing in Portuguese adults 195 in the comparisons and differences in testing instruments and timeframes, the results of repeatability compare well with those found in other studies (Washburn et al. 1993; Pols et al. 1997a; Friedenreich et al. 2006; Cust et al. 2008; Meyer et al. 2009). Therefore, on a group level, the estimate of absolute energy expenditure is reproducible. "
    [Show abstract] [Hide abstract]
    ABSTRACT: No self-report method to measure different types and intensities of physical activity (PA) in adults has been tested in the Portuguese population. We assessed the validity, reproducibility and seasonal bias on past-year PA reporting. A sample of 953 Portuguese adults was evaluated between 2001 and 2003. A 4 x 7-day PA diary was used as a reference method to evaluate the validity of the EPIC questionnaire adapted for the Portuguese population (n = 114). Spearman's correlation coefficients were calculated and agreement was tested using Bland-Altman plots. Trigonometric linear models were used to assess the seasonal variation. Correlations between the questionnaire and the diaries were 0.56, 0.50, 0.88 and 0.78 for total, rest, occupational and leisure-time PA, respectively. The coefficients for reproducibility (2-3 months interval) ranged between 0.80 for leisure and 0.91 for occupational. Visualizing Bland-Altman plots, only rest PA revealed a tendency towards an increase in differences with increasing rest reported. Males interviewed in April and August reported the highest and lowest mean of leisure-time PA, respectively. For professional activities, the probability of amplitude being over one-half standard deviation was 33%. The questionnaire is a valid and reproducible instrument for the brief assessment of usual energy expenditure in adults, detailing different types of PA. In males, seasonal bias on reporting leisure-time and professional PA was found.
    Annals of Human Biology 12/2009; 37(2):185-97. DOI:10.3109/03014460903341836 · 1.15 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Soft-switching techniques have been applied in the design of DC-AC converters in order to achieve better performance, higher efficiency, and higher power density. However, the work that has been done in this field is not widely known. In this paper a systematic overview and generic classification of the soft-switching DC-AC converters is presented. Their operating principles, performance evaluation, and design limitations are discussed. Some possible industrial applications of soft-switched DC-AC converters are addressed
    Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE; 11/1996
Show more