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The pain reports are uncontrolled self-report.\nexposure: Regular winter swimming over four months\nevidence_span: {\"source_cache\": \"artifacts/cold-research/15253480.abstract.txt\", \"locator\": \"Indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"ca9c92e52fcba46785e37751a7b714fcb6ca5a915d12b621e87bc811223a9bfa\", \"start_char\": 0, \"end_char\": 983, \"text_sha256\": \"ca9c92e52fcba46785e37751a7b714fcb6ca5a915d12b621e87bc811223a9bfa\"}\n[cold-p15253480] Winter swimming improves general well-being. (2004). https://pubmed.ncbi.nlm.nih.gov/15253480/ DOI: 10.3402/ijch.v63i2.17700","model_system":"Winter swimmers and controls completing mood questionnaires before and after a four-month season","directness":"author_interpretation","verification_status":"source_derived_draft","notes":"Exact curation-document quotation, not publisher quotation. Study references: [cold-p15253480] Winter swimming improves general well-being. 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