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. 2015 Dec 7;10(12):e0143873. doi: 10.1371/journal.pone.0143873

Table 1. Participant Demographics.

Variable Mean (SD) or Count (%)
Age in years 24.90 (8.08)
Ancestry
 European 301 (46.5%)
 African 97 (15.0%)
 East Asian 97 (15.0%)
 South Asian 52 (8.0%)
 Hispanic 24 (3.7%)
 Other 76 (11.8%)
Sex
 Male 255 (39.4%)
 Female 392 (60.6%)
Education
 Years of education 15.23 (1.97)
 Current student 455 (70.3%)
CIRENS 0.47 (1.19)
BDI 34 (5.3%)
AD[H]D 16 (2.5%)
EPQ-BV
 Extraversion 39.01 (8.27)
 Neuroticism 26.85 (8.04)
Musical Training
 Formal training 354 (54.7%)
 Before age of six 118 (18.2%)

Standard deviation (SD), Circadian Energy Scale (CIRENS), Beck Depression Inventory (BDI), Attention Deficit [Hyperactivity] Disorder, (AD[H]D), Eysenck Personality Questionnaire—Brief Version (EPQ-BV).