Outcome variable | Position | N | Median | IQR | p Value* |
---|---|---|---|---|---|
Heart rate (bpm) | At rest in cot | 19 | 127 | 116–149 | Ref group |
30° | 18 | 127 | 115.3–142.8 | 0.65 | |
40° | 19 | 138 | 126–144 | 0.03 | |
In motion | 18 | 131 | 123.5–143.8 | 0.16 | |
Oxygen saturation (%) | At rest in cot | 19 | 95 | 92–97 | Ref group |
30° | 18 | 93.5 | 93–95.3 | 0.11 | |
40° | 19 | 94 | 91–96 | 0.04 | |
In motion | 18 | 93 | 91–95 | 0.01 | |
Number of desaturations <85% in 30 min (n) | At rest in cot | 19 | 1 | 0.5–1.5 | Ref group |
30° | 18 | 2.5 | 0–6.5 | 0.06 | |
40° | 19 | 4 | 0–7 | 0.06 | |
In motion | 17 | 2 | 0.5–8 | 0.04 | |
Total number of desaturations (n) (fall in SpO2≥4% lasting for ≥10 s per hour) | At rest in cot | 19 | 25 | 13–36 | Ref group |
30° | 18 | 31 | 22–42 | 0.08 | |
40° | 19 | 31 | 23–36 | 0.049 | |
In motion | 17 | 35 | 24–45 | 0.01 | |
Respiratory rate (breaths per minute) | At rest in cot | 18 | 43 | 37.5–52.3 | Ref group |
30° | 17 | 47 | 37.5–52 | 0.28 | |
40° | 18 | 51 | 39.8–56.3 | 0.009 | |
In motion | 17 | 49 | 39.5–55 | 0.02 | |
End-tidal CO2 (kPa) | At rest in cot | 18 | 4.25 | 3.72–4.73 | Ref group |
30° | 17 | 4.51 | 3.81–4.88 | 0.55 | |
40° | 18 | 4.47 | 3.79–5.11 | 0.15 | |
In motion | 17 | 4.21 | 3.73–5.09 | 0.38 | |
Outcome variable | Position | N | N | Per cent | p Value† |
One or more bradycardias (n) | At rest in cot | 19 | 3 | 15.8 | Ref group |
30° | 18 | 1 | 5.6 | 0.48 | |
40° | 19 | 2 | 10.6 | 1.00 | |
In motion | 18 | 3 | 16.7 | 1.00 | |
One or more apnoeas (n) | At rest in cot | 19 | 3 | 15.8 | Ref group |
30° | 18 | 1 | 5.6 | 0.62 | |
40° | 19 | 0 | 0 | 0.25 | |
In motion | 18 | 0 | 0 | 0.25 |
*Wilcoxon test. †McNemar's test.