Epworth Sleepiness Scale
The ESS was administered on days 5 and 26. An ESS score of more than 10 is indicative of excessive daytime sleepiness. Only 38 of 152 patients (25.0%) reported having excessive daytime sleepiness at day 5. Using the McNemar test, the day 5 ESS score was compared with the day 26 ESS score that corresponded closely with the timing for the PSQI administration. On the basis of 113 patients who had data for both time points, no significant differences were found in reported daytime sleepiness between days 5 and 26 (P = .359).