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. 2019 Jul 5;14(7):e0219087. doi: 10.1371/journal.pone.0219087

Table 1. Descriptive data of study population (N = 74 female employees of University Hospital Bergmannsheil, Bochum, working night and day shifts).

Factor N, median Percent,
Interquartile range
TOTAL [N] 74 100
Chronotype† (median, interquartile range) [hh:mm] 4:08 3:32–5:03
Categories of chronotype† [N, %]
        Early (<3:11)
        Intermediate (3:11–4.47)
        Late (>4:47)
15
36
23
20.3
48.7
31.1
Obstructive sleep apnea [N, %] 20 27.0
Age (median, interquartile range) [years] 34 28–47
Body-mass index (median, interquartile range) [kg/m2] 24.8 22.8–29.2
Body-mass index in categories [N %]
        Normal (<25 kg/m2) 42 56.8
        Overweight (≥25 kg/m2) 18 24.3
        Obese (≥30 kg/m2) 14 18.9
Season, [N, %]
    Spring
    Summer
    Fall
    Winter
26
19
16
13
35.2
25.7
21.6
17.6

IQR, Interquartile range

† Chronotype assessed as midpoint of sleep by the Munich ChronoType Questionnaire for shift workers (MCTQshift)