{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T22:50:46Z","timestamp":1790376646426,"version":"4.1.0"},"reference-count":40,"publisher":"BMJ","issue":"8","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Occup Environ Med"],"published-print":{"date-parts":[[2007,8]]},"abstract":"<jats:p><jats:bold>Objectives:<\/jats:bold>To investigate the longitudinal patterns of recovery among workers with compensated occupational back injuries.<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold>A longitudinal cohort study, with one-year follow-up via structured telephone interviews, among respondents off work because of \u201cnew\u201d back injuries. Self-reported pain intensity was recorded at baseline and at four follow-up time points over the course of one year. Workers who answered the questionnaire on at least three occasions (n\u200a=\u200a678) were classified into clusters according to their patterns of pain intensity over time using a two-step cluster analysis.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold>Four pain recovery patterns were identified: workers with high levels of pain intensity showing no improvement over time (43%); those experiencing recovery in the first four months with no further improvement or possibly even some deterioration, in the second half year (33%); those experiencing a slow consistent recovery but still with considerable back pain at the end of the follow-up (12%); and those quickly progressing to low level of pain or resolution (12%). Trajectories of average Roland-Morris Disability scores and SF-36 Role of Physical scores for above clusters mapped consistently with the corresponding patterns in pain. However, individuals with fluctuating, recurrent pain patterns showed the shortest cumulative duration on 100% benefit and the earliest return-to-work among other clusters.<\/jats:p><jats:p><jats:bold>Conclusions:<\/jats:bold>Four clinically sensible patterns were identified in this cohort of injured workers, suggesting inter-individual differences in back pain recovery. The results confirm that recurrent or chronic back pain is a typical condition in respondents with new back injuries. Pain intensity and disability scores are good measures of recovery of back pain at the individual level. After initial return-to-work, or cessation of benefits, administrative measures of percentage of respondents back at work, or no longer on benefits, may not accurately reflect an individual\u2019s condition of back pain.<\/jats:p>","DOI":"10.1136\/oem.2006.029215","type":"journal-article","created":{"date-parts":[[2007,3,27]],"date-time":"2007-03-27T00:50:37Z","timestamp":1174956637000},"page":"534-540","source":"Crossref","is-referenced-by-count":42,"title":["The recovery patterns of back pain among workers with compensated occupational back injuries"],"prefix":"10.1136","volume":"64","author":[{"given":"Cynthia","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sheilah","family":"Hogg-Johnson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Smith","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2007,3,26]]},"reference":[{"key":"2024052223261027000_64.8.534.1","doi-asserted-by":"crossref","first-page":"605","DOI":"10.1097\/00007632-199106000-00001","volume":"16","year":"1991","journal-title":"Spine"},{"key":"2024052223261027000_64.8.534.2","first-page":"337","volume":"19","year":"1992","journal-title":"J Rheumatol"},{"key":"2024052223261027000_64.8.534.3","unstructured":"Workplace Safety & Insurance Board of Ontario. 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