EPI 202 Lab 3.docx - EPI 202 Lab 3 1 The following data come from a study in Malmo Sweden of jobrelated mechanical exposure compared to no medical

EPI 202 Lab 3.docx - EPI 202 Lab 3 1 The following data...

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EPI 202 Lab 31.The following data come from a study in Malmo, Sweden of job-related mechanical exposure compared to no medical exposureand neck or shoulder pain. The study investigators followed 2,605men free of neck or shoulder pain at baseline for the incidence ofneck or shoulder pain over a one year period. The authors wereconcerned that there could be confounding by job strain (definedby a combination of job demands and job decisions). Assume noloss to follow-up and no competing risks for this data. EpidemiolCommunity Health (9): 721-8No Job StrainJob StrainExposureNo ExTotalExposureNo ExTotalCase91103194251136No60614642070157148305Total697156722641821593411. Test the null hypothesis that there is no association betweenmechanical exposure compared to no mechanical exposure andthe 1-year cumulative incidence of neck or shoulder pain, afterstratifying by job strain. State the null and alternative hypotheses.Interpret your findings.(Var(a|H0) = 37.796 for no job strain, 8.013 for job strain)H0: After stratifying by job strain, there is no association betweenmechanical exposure and 1y cumulative incidence of neck or shoulderpain.(CIRMH=1, CIDsumm=0)HA: After stratifying by job strain, there is an association between
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