Table 1 Summary of the study population.

Total number of patients

15

Total recording time (h)^a

233.5

Gender^b

 Male

9 (60.0%)

 Female

6 (40.0%)

Age (years)^c

62.2 (12.4)

Clinical specialty^b

 Maxillofacial

10 (60.7%)

 Lower GI

2 (13.3%)

 Upper GI

2 (13.3%)

 Gynaecological/Oncology

1 (6.7%)

APACHE II score^c

15.7 (4.5)

RASS score < 0^b

9 (60.0%)

Ventilation status^b,d

 Bilevel

7 (47.7%)

 None

8 (53.3%)

Propofol infusion^b,d

6 (40.0%)

Fitzpatrick skin type^b

 I

2 (13.3%)

 II

12 (80.0%)

 III

1 (6.7%)

Recording time per patient (h)^a,c

15.6 (8.7)

 Day

6.8 (4.5)

 Night

8.8 (5.5)