Validation of newly developed and redesigned key indicator methods for assessment of different working conditions with physical workloads based on mixed-methods design: a study protocol.

BMJ Open · 2017 · PMC5724210 · PMID 28827239

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an increasing trendno p-value reported

However, an increasing trend with increasing physical workloads from exposure level ‘low’ to exposure level ‘high’ is expected.

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