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. 2015 Jun 4;10(6):e0128273. doi: 10.1371/journal.pone.0128273

Table 1. Participant characteristics shown for the entire sample (n = 43) and separately for individuals recording no lapses on the PVT (n = 16) compared to individuals with a high number of lapses (4+, n = 16) two hours after waking.

Range mean ± SD No lapses 4+ lapses p*
(mean ± SD) (mean ± SD)
Gender 22 M, 21 F 5 M, 11 F 10 M, 6 F 0.077
Age (years) 18.4–31.0 22.53 ± 3.07 23.06 ± 3.67 22.40 ± 2.79 NS
Body Mass Index (kg/m2) 18.7–30.5 22.34 ± 2.83 22.31 ± 2.66 21.93 ± 3.21 NS
Horne-Ostberg Questionnaire 38–70 53.55 ± 7.45 54.97 ± 6.81 51.53 ± 6.73 NS
Sleep onset time (h) 21:51–24:58 23:48 ± 00:55 23:34 ± 0:51 23:59 ± 0:59 NS
Dim Light Melatonin Onset (h) 19:06–01:00 21:38 ± 01:23 20:52 ± 0:55 22:27 ± 1:33 0.001
Phase angle difference (dec h) -0.31–4.14 2.16 ± 1.08 2.70 ± 0.83 1.54 ± 1.07 0.002

* Characteristics between groups were compared using Student’s t-test. Gender was compared using Chi-Squared test.