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. 2017 Oct 26;12(10):e0186843. doi: 10.1371/journal.pone.0186843

Table 2. Main and interaction effects of ancestry and condition on sleep and cognitive performance.

  Ancestry Condition Ancestry*Condition
Measures DF F P DF F P DF F P
TST Logs 1,43 0.83 0.37 1,43 31.42 0.00* 1,43 0.67 0.42
TST Actigraphy 1,41 1.21 0.28 1,41 13.51 0.00* 1,41 0.61 0.44
EMA Actigraphy 1,41 2.63 0.11 1,41 15.79 0.00* 1,41 0.92 0.34
Columbia Jet Lag Scale 1,43 3.72 0.06 1,43 41.31 0.00* 1,43 0.15 0.70
SSS 1,43 2.03 0.16 1,43 45.75 0.00* 1,43 1.29 0.26
SRT Lapses 1,40 0.09 0.77 1,40 7.11 0.01* 1,40 0.27 0.61
SRT Median RT 1,40 0.03 0.85 1,40 5.74 0.02* 1,40 0.55 0.46
CSL % correct 1,43 0.83 0.37 1,43 7.07 0.01* 1,43 4.75 0.04*
CSD % correct 1,43 0.39 0.54 1,43 9.67 0.00* 1,43 0.01 0.91
GNG d-Prime 1,43 0.03 0.86 1,43 10.12 0.00* 1,43 1.92 0.17
MTH % correct 1,43 0.63 0.43 1,43 0.00 0.96 1,43 0.25 0.62
M2S % correct 1,43 0.05 0.83 1,43 1.00 0.32 1,43 0.01 0.93
ProRT SR 1,86 0.19 0.67 1,86 3.80 0.05 1,86 0.15 0.70
ProRT Medium RT 1,43 1.00 0.32 1,43 0.07 0.80 1,43 1.05 0.31
Mood—Vigor 1,43 1.74 0.19 1,43 35.5 0.00* 1,43 0.86 0.36
Mood- Happiness 1,43 6.00 0.02* 1,43 28.04 0.00* 1,43 0.06 0.81
Mood- Depression 1,43 1.73 0.20 1,43 0.50 0.48 1,43 1.81 0.19
Mood- Anger 1,43 1.45 0.24 1,43 3.31 0.08 1,43 0.22 0.64
Mood- Fatigue 1,43 3.10 0.09 1,43 34.74 0.00* 1,43 1.92 0.17
Mood- Anxiety 1,43 0.00 1.00 1,43 1.15 0.29 1,43 0.14 0.91
Mood- Restlessness 1,43 2.73 0.11 1,43 2.99 0.09 1,43 0.23 0.63

Ancestry was either African-American or European-American, and Condition was either Baseline (circadian rhythms aligned with sleep) or Delayed (circadian rhythms misaligned relative to sleep).

* Significant (p≤0.05) main effect of ancestry, condition, or their interaction.

TST: Total Sleep Time. EMA: Early Morning Awakening. SSS: Stanford Sleepiness Scale. SRT: Simple Reaction Time, lapses (RT <500ms.). CSL % correct: Code Substitution Learning percent correct responses. CSD % correct: Code Substitution Delayed percent correct responses. GNG d-Prime: Go/No-Go task d-prime score. MTH % correct: Mathematical Processing task percent correct responses. M2S % correct: Matching to Sample task percent correct responses. Pro RT SR: Procedural Reaction Time task number of Slow Responses (responses exceeding the 90th percentile of each participant’s baseline responses). Pro RT Median RT: Procedural Reaction Time task median RT. SRT data from three participants was excluded and actigraphy data from two participants was lost (refer to methods).