Table 1.

Patient characteristics.

	All patients = 194
Gestational age in weeks, median (IQR)	31 (29–34)
Weight in g, median (IQR)	1,495 (1,079–1,975)
Postnatal age in days, median (IQR)	7 (3–13)
Female, n (%)	90 (47)
Warm and pink extremities, n (%)	181 (94)
Venous blood sample from hand/foot, n (%)	189 (98)
Capillary blood sample from heel, n (%)	191 (99)
Crying during sampling, n (%)	30 (16)
Capillary refill time central <3 s, n (%)	173 (90)
Capillary refill time peripheral <3 s, n (%)	182 (94)
Respiratory support, total, n (%)	108 (56)
Invasive ventilation, n (%)	27 (14)
Non-invasive ventilation, n (%)	63 (32)
Temperature of the skin (n = 181), median (IQR)	36.8 (36.5–37.1)
Rectal body temperature (n = 142), median (IQR)	37.0 (36.7–37.2)
Use of inotropic, n (%)	5 (3)
Hypotension defined as mean blood pressure below gestational age, n (%)	5 (3)