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. Author manuscript; available in PMC: 2013 Nov 25.
Published in final edited form as: Arch Intern Med. 2008 Nov 10;168(20):10.1001/archinte.168.20.2225. doi: 10.1001/archinte.168.20.2225

Figure 2.

Figure 2

Event-free survival Kaplan-Meier curves for four categories by shorter/longer sleep time and riser/non-riser pattern. Log-rank statistic between shorter- vs. longer sleep risers is 6.42 (P=0.03), shorter- vs. longer sleep non-risers 0.07 (P=.79). Log-rank statistic between longer sleep risers vs. longer sleep non-risers was 9.45 (P=0.008), and shorter sleep risers vs. shorter sleep non-risers was 23.8 (P<0.001). Log-rank statistic between shorter sleep risers vs. longer sleep non-risers is 35.0 (P<0.001), and longer sleep risers vs. shorter sleep non-risers is 5.66 (P=0.03).