Document Classification

Section Type: RESULTS

Text: Both coffee and napping reduced the risk of inappropriate line crossings, compared with placebo, in young participants (respectively, by three-quarters, incidence rate ratios [IRR] = 0. 26 95 % confidence interval [CI], 0. 09-0. 74, P < 0. 05 and by two thirds, IRR = 0. 34 95 % CI, 0. 20-0. 58, P < 0. 001) and in middle-aged participants (respectively by nine tenths, IRR = 0. 11 95 % CI, 0. 05-0. 21, P < 0. 001 and by one fifth, IRR = 0. 77 95 % CI, 0. 63-0. 95, P < 0. 05).