title: Self-administered physical activity questionnaires for the elderly: a systematic review of measurement properties.
abstract: OBJECTIVE
  To systematically review and appraise studies examining self-administered physical activity questionnaires (PAQ) for the elderly. This article is one of a group of four articles in Sports Medicine on the content and measurement properties of PAQs. LITERATURE SEARCH METHODOLOGY: Searches in PubMed, EMBASE and SportDiscu (until May 2009) on self-administered PAQ. Inclusion criteria were as follows: (i) the study examined (at least one of) the measurement properties of a self-administered PAQ; (ii) the questionnaire aimed to measure physical activity (PA) in older people; (iii) the average age of the study population was >55 years; (iv) the article was written in English. We excluded PA interviews, diaries and studies that evaluated the measurement properties of a self-administered PAQ in a specific population, such as patients. We used a standard checklist (qualitative attributes and measurement properties of PA questionnaires [QAPAQ]) for appraising the measurement properties of PAQs.
  
  
  RESULTS
  Eighteen articles on 13 PAQs were reviewed, including 16 reliability analyses and 25 validity analyses (of which 15 were on construct validity, seven on health/functioning associations, two on known-groups validity and one on responsiveness). Many studies suffered from methodological flaws, e.g. too small sample size or inadequate time interval between test and retest. Three PAQs received a positive rating on reliability: IPAQ-C (International Physical Activity Questionnaire-Chinese), intraclass correlation coefficient (ICC) > or = 0.81; WHI-PAQ (Women's Health Initiative-PAQ), ICC = 0.76; and PASE (Physical Activity Scale for the Elderly), Pearson correlation coefficient (r) = 0.84. However, PASE was negatively rated on reliability in another study (ICC = 0.65). One PAQ received a positive rating on construct validity: PASE against Mini-Logger (r > 0.52), but PASE was negatively rated in another study against accelerometer and another PAQ, Spearman correlation coefficient = 0.17 and 0.48, respectively. Three of the 13 PAQs were tested for health/functioning associations and all three were positively rated in some categories of PA in many studies (r > 0.30).
  
  
  CONCLUSIONS
  Even though several studies showed an association between the tested PAQ and health/functioning variables, the knowledge about reliability and construct validity of self-administrated PAQs for older adults is still scarce and more high-quality validation studies are needed.
authors.affiliation: Norwegian Institute of Public Health, Division of Epidemiology, Oslo, Norway. Lisa.forsen@fhi.no
authors.forename: Lisa
authors.initials: L
authors.lastname: Forsén
authors.forename: Nina Waaler
authors.initials: NW
authors.lastname: Loland
authors.forename: Anne
authors.initials: A
authors.lastname: Vuillemin
authors.forename: Mai J M
authors.initials: MJ
authors.lastname: Chinapaw
authors.forename: Mireille N M
authors.initials: MN
authors.lastname: van Poppel
authors.forename: Lidwine B
authors.initials: LB
authors.lastname: Mokkink
authors.forename: Willem
authors.initials: W
authors.lastname: van Mechelen
authors.forename: Caroline B
authors.initials: CB
authors.lastname: Terwee
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D057189:Checklist / Q000592:standards; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires