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Table 1 A summary of data collected and corresponding outcome measures

From: Genetics, sleep and memory: a recall-by-genotype study of ZNF804A variants and sleep neurophysiology

  Data source Outcome measures
Primary outcome measures Polysomnography Sleep variables derived from scored recordings, e.g. total sleep time (TST), sleep onset latency (SOL), sleep efficiency (SE), wake after sleep onset (WASO)
Time spent in each sleep stage; S1, S2, Slow wave sleep (SWS) and rapid eye movement sleep (REM)
Spectral composition of EEG data (delta, theta, alpha, sigma and beta frequency bands)
Motor sequence task Number of correct sequences pre- and post-sleep
Percentage improvement
Reaction time pre- and post-sleep
Secondary outcome measures Actigraphy Sleep/Wake estimates e.g. sleep period, sleep efficiency, total sleep time.
Non-parametric circadian rhythm analysis (NPCA) e.g. 10 most active hours (M10), 5 least active hours (L5)
Daily activity levels
Sleep diary Detailed information about rest/activity routine (to aid interpretation of actigraphy)
Pittsburgh Sleep Quality Index Sleep quality (over previous month)
Bristol Sleep Profile Assessment for sleep disorders (eligibility)
St Mary’s Hospital Sleep Questionnaire Sleep quality, latency, continuity, satisfaction etc. (study nights)
Leeds Sleep Evaluation Questionnaire Total Score and individual components; Getting to sleep, quality of sleep, awake following sleep, behaviours following awakening (study nights)
  Stanford Sleepiness Scale Assessment of alertness prior to MST