Table 1

Outcome for all infants

Outcome variable	Position	N	Median	IQR	p Value*
Heart rate (bpm)	At rest in cot	39	145	127–155	Ref group
	30°	36	143.5	126.5–156.8	0.69
	40°	39	150	135–158	0.01
	In motion	37	150	129–157.5	0.047
Oxygen saturation (%)	At rest in cot	39	96	93–97	Ref group
	30°	36	94.5	93–96	0.42
	40°	39	94	92–96	0.03
	In motion	37	93	91–95	0.0003
Number of desaturations <85% in 30 min (n)	At rest in cot	39	1	0–7	Ref group
	30°	36	3	0.3–7	0.12
	40°	38	4	0–6	0.17
	In motion	35	6	1–11	0.001
Total number of desaturations (n) (fall in SpO₂≥4% lasting for ≥10 s per hour)	At rest in cot	39	26	19–36	Ref group
	30°	36	33	22–41	0.03
	40°	39	32	24–37	0.005
	In motion	36	39	28–46	<0.0001
Respiratory rate (breaths per minute)	At rest in cot	38	42	39–50	Ref group
	30°	35	45	39–49	0.12
	40°	38	48	38.8–55	0.0004
	In motion	36	46.5	41–50.8	0.009
End-tidal CO₂ (kPa)	At rest in cot	38	4.58	3.99–5.13	Ref group
	30°	35	4.56	3.88–5.07	0.84
	40°	38	4.61	4.13–5.08	0.32
	In motion	36	4.65	4.20–5.14	0.38
Outcome variable	Position	N	n	Per cent	p Value†
One or more bradycardias (n)	At rest in cot	39	4	10.3	Ref group
	30°	36	2	5.6	0.62
	40°	39	2	5.2	0.62
	In motion	37	3	8.1	0.68
One or more apnoeas (n)	At rest in cot	39	6	15.4	Ref group
	30°	36	1	2.8	0.13
	40°	39	2	5.1	0.45
	In motion	37	0	0	0.13

*Wilcoxon test. †McNemar's test.