Journal Article Reproducibility and Validity of a Self-Administered Physical Activity Questionnaire Get access ANNE M WOLF, ANNE M WOLF *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar DAVID J HUNTER, DAVID J HUNTER *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA**Department of Epidemiology, Harvard School of Public HealthBoston, MA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar GRAHAM A COLDITZ, GRAHAM A COLDITZ *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA**Department of Epidemiology, Harvard School of Public HealthBoston, MA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar JOANN E MANSON, JOANN E MANSON *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA†Division of Preventive Medicine, Department of Medicine, Brigham and Women's HospitalBoston, MA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar MEIR J STAMPFER, MEIR J STAMPFER *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA**Department of Epidemiology, Harvard School of Public HealthBoston, MA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar KAREN A CORSANO, KAREN A CORSANO *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar BERNARD ROSNER, BERNARD ROSNER *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA‡Department of Biostatistics, Harvard School of Public HealthBoston. MA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar ANDREA KRISKA, ANDREA KRISKA §Department of Epidemiology, Graduate School of Public Health, University of PittsburghPA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar WALTER C WILLETT WALTER C WILLETT *Channing Laboratory, Department of Medicine, 180 Longwood Avenue, Harvard Medical School and Brigham and Women's HospitalBoston, MA 02115, USA**Department of Epidemiology, Harvard School of Public HealthBoston, MA, USA∥Department of Nutrition, Harvard School of Public HealthBoston, MA, USA Search for other works by this author on: Oxford Academic PubMed Google Scholar International Journal of Epidemiology, Volume 23, Issue 5, October 1994, Pages 991–999, https://doi.org/10.1093/ije/23.5.991 Published: 01 October 1994 Article history Received: 01 March 1994 Published: 01 October 1994