Figure 7.

Association between objective sleep parameters and four factors based on performance variables: (A) controlled for sex, (B) controlled for sex and age. LPS, latency to persistent sleep (min); TST, total sleep time (min); SE, sleep efficiency (%); NAW, number of awakenings; REM, rapid eye movement; Stage 1, duration of stage 1 sleep (min); Stage 2, duration of stage 2 sleep (min); Stage 4, duration of stage 4 sleep (min); SWS, slow wave sleep; SWA, slow wave activity (μV²); SWApct, slow wave activity in percentage of total power; SFA, sigma activity (μV²); SFApct, sigma activity in percentage of total power.