Table 1.

Descriptive statistics.

Variable (possible range)	Observed range	M ± SD	Skew	Kurtosis
Age in years	18–58	20.42 ± 4.10	4.05	23.6
Prior night sleep in hours	0–14	7.45 ± 1.66	−0.80	3.34
Tiredness scale (0–10)	0–10	4.28 ± 2.40	0.19	−0.59
Objective attention score (0–4)	0–4	2.82 ± 1.02	−0.58	−0.36
Subjective attention score (1–10)	1–10	7.67 ± 2.11	−0.93	0.25
LSRPS: primary (16–64)	16–54	27.70 ± 6.95	0.97	0.86
LSRPS: secondary (10–40)	10–34	19.80 ± 4.63	0.34	−0.25
Dirty Dozen: psychopathy (4–36)	4–32	9.64 ± 5.75	1.29	1.40
PPTS combined (0–20)	0–18	5.77 ± 3.20	0.72	0.70

Note: Internal consistency was acceptable for all measures of psychopathy: LSRPS: primary (α = 0.808); LSRPS: secondary (α = 0.671); Dirty Dozen: psychopathy (α = 0.770); PPTS combined (α = 0.710).