Single correlations between sleep study indices and change in systolic and diastolic BP overnight in men and women (n = 448)
| Mean Sao 2 | Minimum Sao 2 | BP rises/ h | >10 bpm heart rate rises/h | >6 bpm heart rate rises/h | Mean respiratory effort | Snores/h | Age | Systolic BP3-150 change overnight | Diastolic BP3-150change overnight | |
| >4% Sao 2dips/h | –0.53 | –0.59 | 0.25 | 0.05 | 0.03 | 0.21 | 0.23 | 0.22 | 0.17 | 0.21 |
| Mean Sao 2 | 0.52 | 0.16 | –0.08 | –0.04 | –0.21 | –0.19 | 0.29 | –0.09 | –0.17 | |
| Minimum Sao 2 | 0.17 | –0.03 | 0.00 | –0.23 | –0.21 | 0.18 | –0.14 | –0.15 | ||
| BP rises/h | 0.44 | 0.39 | 0.42 | 0.06 | 0.17 | 0.07 | 0.11 | |||
| >10 bpm heart rate rises/h | 0.92 | 0.32 | 0.00 | 0.07 | 0.12 | 0.11 | ||||
| >6 bpm heart rate rises/h | 0.28 | 0.00 | 0.13 | 0.10 | 0.05 | |||||
| Mean respiratory effort | 0.21 | 0.08 | 0.23 | 0.16 | ||||||
| Snores/h | 0.11 | 0.03 | 0.03 | |||||||
| Age | 0.04 | 0.15 | ||||||||
| Systolic BP change overnight | 0.60 |
↵3-150 Negative value indicates a fall overnight, positive value indicates a rise.
Any r value over 0.10 is significant at the 0.05 level, any r value over 0.17 is significant at the 0.0001 level.