When comparing the individual ethnic groups, results are presented as IRRs and 99% floating confidence intervals (FCIs).
When comparing the individual ethnic groups, we use 99% floating confidence intervals (FCIs), calculated using the method of floating absolute risks, which enable valid comparisons between any two groups, even if neither one is the baseline (Easton et al, 1991; Plummer, 2004).
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Floating 95% confidence intervals for the IRR categorised according to the number of CT scans were calculated using the amount of information in each category.
Even relatively short intervals of floating behavior can cause significant changes in the mean raw average speed of a trial.
The method of floating absolute risks leads to confidence intervals that are approximately independent and are therefore readily interpreted (Plummer, 2004).
In Figure 2, because more than two groups were compared, variances were estimated by treating the relative risks as floating absolute risks, yielding group-specific confidence intervals (g-s CI) (Easton et al, 1991).
The TL reduction in IS (RS) participants corresponded to the reduction in control participants -.167/-.00657 = 27.9 (-.184/-.00657 = 27.9) years older (slight differences due to floating point arithmetic and rounding), bootstrapped 95% confidence interval 13.9-58.6 (13.9-58.6).
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95% confidence intervals for cumulative risks were calculated using floating absolute risks to obtain the variance of the logarithm of OR Var(log r) (Easton et al, 1991) and subsequently incorporating a Taylor series expansion.
