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Linear regression results for log of real cost (premiums) per employed worker: U.S., 1973–2007
aRegression #1 omitted the lost-time-cases covariate, regression #2 omitted the all-cases covariate, and regression #3 included all covariates.
bThe sample size was 35 for each regression. The statistical significance of the entire regression (F-statistic) for all regressions was p<0.0001.
cThe covariate did not enter regression.
NA = not applicable
