Table 2

Arousal thresholds; threshold of sound phase level (SPL) in dB (range) and number (n) with no response to maximum SPL for changes in outcomes

OutcomesSmoke exposed*Non-smoke exposed*p value
*Median (range).
REM sleep
Behavioural arousal69.2 (63–75.0), n=263.0 (63–86.2), n=10.5
EEG65.0 (63–86.2), n=063.0 (63–86.2), n=10.29
Heart rate64.0 (63–73.3), n=468.2 (63–86.2), n=20.31
Respiratory rate63.0 (63–65), n=163.0 (63–73.3), n=30.29
NREM sleep
Behavioural arousal75.8 (63–77.4), n=579.5 (73.3–86.2), n=00.01
EEG69.2 (63–81.5), n=273.3 (63.0–86.2), n=00.21
Heart rate70.4 (63–86.2), n=677.4 (63.0–86.2), n=30.5
Respiratory rate63.0 (63–75.8), n=165.0 (63.0–81.5), n=10.77