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Table 1 Sample characteristics of offshore workers (N = 36)

From: The courses of objective physical activity and the association with sleepiness during a 2-week-on/2-week-off offshore shift rotation: an observational repeated-measures study

Age (years) (M, SD)

44.3 (11.1)

Nationality (%)

 British

8 (22.2)

 Australian

2 (5.6)

 Dutch

26 (72.2)

Job function (%)

 Operations

10 (27.8)

 Maintenance

15 (41.7)

 Catering

1 (2.8)

 Supervision

6 (16.7)

 Safety

2 (5.5)

 Other

2 (5.5)

Perceived general health (SF-1) (%)

 Excellent, very good, good

35 (97.2)

 Fair, poor

1 (2.8)

BMI (%)

 Normal weight

14 (38.9)

 Overweight

17 (47.2)

 Obese

5 (13.9)

Smoking

 Yes (%)

9 (25.0)

 Packs/week (M, SD)

1.2 (2.1)

Alcohol consumption

 Yes (%)

32 (88.9)

 Glasses/week (M, SD)

8.0 (9.3)