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Purpose of study clearly stated (aetiology versus prognosis)
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Main features of study population described
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Response rate 80% at baseline and reported at follow up
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Psychosocial data collected using validated instrument
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Data on physical workload collected
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Clear, reproducible definition of low back pain
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Low back pain data collected for at least one year
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Multivariate analysis including confounder control
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Outcome measures (OR, RR) reported with 95% confidence intervals
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