Table 2.

Quality of sleep items

Item	n	%
Q1—troubles falling asleep in the past 4 weeks (n=232)
Not at all	86	37.1
<1 time/week	78	33.6
1–2 times/week	46	19.8
≥3 times/week	22	9.5
Q2—troubles sleeping through in the past 4 weeks (n=237)
Not at all	81	34.2
<1 time/week	74	31.2
1–2 times/week	43	18.1
≥3 times/week	39	16.5
Q3—sleep quality in the past 4 weeks (n=236)
Very good	29	12.3
Fairly good	158	66.9
Poor	45	19.1
Very bad	4	1.7
Q4—sleep quality during offshore commitments (n=236)
Very good	29	12.3
Fairly good	118	50.0
Poor	81	34.3
Very bad	8	3.4
Q5—sleep quality during onshore leave (n=239)
Very good	63	26.4
Fairly good	155	64.9
Poor	21	8.8
Very bad	0	0