{
  "abstract": "This study aimed to quantify the longitudinal tracking and cross-sectional construct validity of a single-item questionnaire measuring recreational physical activity frequency (RPAF) in the Womens Healthy Ageing Project. At baseline, 474 participants aged 45-55 reported RPAF from 1993 to 2014. Longitudinal tracking of the RPAF item was assessed as a consecutive-wave and baseline-referenced measure using linear weighted kappa (LWK), Spearman correlations, exact agreement and within-one-category agreement. Construct validity in the form of convergent and known-group validity was assessed using the International Physical Activity Questionnaire (IPAQ) leisure activity domains, Short Form 36 physical function (SF-36-PF) subscale, Timed Up and Go (TUG), hand grip strength (HGS) and waist-to-height ratio (WhTR). 474 participants provided baseline RPAF data. Pairwise longitudinal samples ranged from 176 to 459 across the study. Consecutive-wave LWK ranged from 0.38 to 0.49, and Spearman correlations ranged from 0.44 to 0.57. Exact and within-category agreement ranged from 41.4%-50.8% and 72.0%-79.0%. Baseline-referenced LWK ranged from 0.22 to 0.47, with Spearman correlations of 0.29 to 0.56. RPAF correlated with total IPAQ leisure score (rs = 0.60), IPAQ walking score (rs = 0.58), SF-36-PF (rs = 0.33) and TUG score (rs = -0.25). No significant correlation was identified between RPAF, HGS or WhTR. RPAF discriminated known groups for WHO guideline-sufficient activity, SF-36-PF, and TUG fall risk. The RPAF item demonstrated fair-to-moderate agreement in consecutive waves, with weaker baseline-referenced tracking. Cross-sectional validity was highest with total IPAQ leisure activity. The item may provide a pragmatic measure for RPAF in womens cohort studies.",
  "abstract_shown": true,
  "affiliations": [
    "School of Health and Biomedical Sciences, RMIT University"
  ],
  "article_type": "PUBLISHAHEADOFPRINT",
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "name": "D. Corcoran"
    },
    {
      "name": "C. Szoeke"
    },
    {
      "name": "V. Apostolopoulos"
    },
    {
      "affs": [
        0
      ],
      "name": "J. Feehan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/er8r1qyke7mj5.bib",
  "cited_by": 0,
  "doi": "10.64898/2026.08.27.26361567",
  "fulltext_url": "https://www.medrxiv.org/content/10.64898/2026.08.27.26361567v1.full",
  "id": "er8r1qyke7mj5",
  "issns": [],
  "landing_url": "https://www.medrxiv.org/content/10.64898/2026.08.27.26361567v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "medrxiv",
      "public and global health"
    ],
    [
      "openalex",
      "2737|Physical Activity and Health"
    ]
  ],
  "openalex": "W7204821234",
  "pdf_url": "https://www.medrxiv.org/content/10.64898/2026.08.27.26361567v1.full.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/er8r1qyke7mj5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:25Z",
      "native_id": "10.64898/2026.08.27.26361567",
      "source": "medrxiv",
      "url": "https://www.medrxiv.org/content/10.64898/2026.08.27.26361567v1"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "medrxiv:public and global health",
      "subfield": "epidemiology-public-health"
    }
  ],
  "title": "Longitudinal Tracking and Construct Validity of a Single-Item Physical Activity Measure in the Womens Healthy Ageing Project",
  "title_text": "Longitudinal Tracking and Construct Validity of a Single-Item Physical Activity Measure in the Womens Healthy Ageing Project",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:25Z",
  "url": "https://research.draconitic.com/paper/er8r1qyke7mj5",
  "venue": "medRxiv",
  "versions": []
}