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Abbreviations
| ANOVA |
analysis of variance |
| ANOCOVA |
analysis of covariance |
| BMI |
body mass index |
| BP |
blood pressure |
| CI |
confidence interval |
| CIR |
cumulative incidence ratio |
| D |
day |
| DART |
Division of Applied Research and Technology |
| E |
evening |
| h |
hour |
| M |
mean |
| N |
night |
| NIOSH |
National Institute for Occupational Safety and Health |
| NS |
not significant |
| OR |
odds ratio |
| OSHA |
Occupational Safety and Health Administration |
| PR |
prevalence risk ratio |
| R |
range |
| RR |
relative risk ratio |
| wk |
week |
| y |
years |
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