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.