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Table 1 Changes in coding system and duration of military service during the study period in 1990–2002.

From: Incidence and trends of low back pain hospitalisation during military service – An analysis of 387,070 Finnish young males

Change

year

ICD-coding system

1996

Duration of service from 9 and 11 months to 6, 9 or 12 months

1995

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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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