Table 1.
Comparisons of polysomnographic parameters between Ab[-] and Ab[+] groups, and in compared to healthy control subjects
| PSG parameters | Ab[-] group (n=11) |
Ab[+] group (n=76) |
p values* | Control group (n=26) |
p values# |
|---|---|---|---|---|---|
| TRT (min) | 496.8+84.2 | 522.0+238.2 | 0.999 | 466.8+27.2 | 0.476 |
| TST (min) | 340.4+118.4 | 374.4+157.9 | 0.764 | 393.0+63.6 | 0.570 |
| SE (%) | 73.2+20.8a,b | 69.0+18.8a | 0.595 | 81.8+12.8b | 0.030 |
| SL (min) | 34.2+31.9 | 52.4+103.8 | 0.729 | 17.4+16.7 | 0.227 |
| REML (min) | 254.2+77.4a | 143.6+84.7b | 0.004 | 112.8+77.0b | 0.001 |
| WASO (min) | 137.0+105.8 | 164.2+187.5 | 0.999 | 85.8+64.0 | 0.129 |
| N1 sleep (%) | 8.2+10.2a | 12.9+11.4b | 0.043 | 8.7+3.6a | 0.037 |
| N2 sleep (%) | 37.3+15.2a | 40.3+17.2a,b | 0.835 | 47.4+8.2b | 0.036 |
| N3 sleep (%) | 34.6+26.6 | 18.4+13.8 | 0.174 | 23.4+5.2 | 0.176 |
| R sleep (%) | 9.7+6.2a | 11.6+6.9a | 0.672 | 16.8+6.2b | 0.008 |
| AHI (per hour) | 6.0+11.6a,b | 12.6+15.0a | 0.061 | 4.3+3.6b | 0.031 |
| Mean O2 saturation (%) | 94.8+2.4 | 95.0+0.2 | 0.872 | 95.7+1.4 | 0.374 |
| Minimum O2 saturation (%) | 85.5+5.5 | 85.4+8.8 | 0.642 | 88.2+4.1 | 0.478 |
| PLMSI (per hour) | 5.0+4.2 | 17.1+19.9 | 0.529 | 9.0+11.2 | 0.253 |
bold for statistical significance.
TRT total recording time, TST total sleep time, SE sleep efficiency, SL sleep latency, REML REM sleep latency, WASO wakefulness after sleep onset, N1 NREM sleep stage 1, N2 NREM sleep stage 2, N3 NREM sleep stage 3, R NREM sleep stage REM, AHI apnea-hypopnea index, PLMSI index of periodic leg movements in sleep.
*p values between Ab[-] and Ab[+] groups.
#p values between Ab[-], Ab[+] and control groups - a-b not statistically different for the parameters with the same letter for each test.