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© 1994 Oxford University Press

research-article

Reproducibility and Validity of a Self-Administered Physical Activity Questionnaire

ANNE M WOLF*, DAVID J HUNTER*,**, GRAHAM A COLDITZ*,**, JOANN E MANSON*,{dagger}, MEIR J STAMPFER*,**, KAREN A CORSANO*, BERNARD ROSNER*,{ddagger}, ANDREA KRISKA§ and WALTER C WILLETT*,**,||

* Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's Hospital Boston, MA 02115, USA
** Department of Epidemiology, Harvard School of Public Health Boston, MA, USA
{dagger} Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital Boston, MA, USA
{ddagger} Department of Biostatistics, Harvard School of Public Health Boston. MA, USA
§ Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh PA, USA
|| Department of Nutrition, Harvard School of Public Health Boston, MA, USA

BACKGROUND: The reproducibility and validity of self-administered questionnaires on physical activity and inactivity were examined in a random (representative) sample of the Nurses' Health Study II cohort and a random sample of African-American women in that cohort.

METHODS: Repeat questionnaires were administered 2 years apart. Past-week activity recalls and 7-day activity diaries were the referent methods; these instruments were sent to participants four times over a 1-year period.

RESULTS: The 2-year test-retest correlation for activity was 0.59 for the representative sample (n = 147) and 0.39 for the African-American sample (n = 84). Correlations between activity reported on recalls and that reported on questionnaire were 0.79 and 0.83 for the representative and African-American samples, respectively. Correlations between activity reported in diaries and that reported on questionnaire were 0.62 and 0.59, respectively. Test-retest coefficients for inactivity were 0.52 and 0.55, respectively. Correlations between inactivity reported in diaries and that reported on questionnaire were 0.41 and 0.44, respectively.

CONCLUSIONS: The simple, short questionnaires on activity and inactivity used in the Nurses' Health Study II are reasonably valid measures for epidemiological research.

Received 1 March 1994


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