Table 5.
SOL and ORP variables according to nap order
| SOLa | ORP at SOL | Average ORPb | Lowest ORPa | Time of lowest ORP | Lowest ORP first 5 minutesb | |
|---|---|---|---|---|---|---|
| Nap 1 | 11.5 (7.4) | 1.60 (0.34) | 1.83 (0.43) | 1.12 (0.64) | 13.0 (5.5) | 1.82 (0.43) |
| Nap 2 | 6.3 (5.4)* | 1.62 (0.35) | 1.52 (0.44)* | 0.69 (0.44)* | 13.7 (5.1) | 1.45 (0.60)* |
| Nap 3 | 8.9 (6.8)+ | 1.50 (0.34) | 1.64 (0.44)+ | 0.80 (0.58)+ | 13.7 (4.4) | 1.68 (0.54)+ |
| Nap 4 | 9.9 (6.0) | 1.63 (0.35) | 1.77 (0.39) | 0.88 (0.56) | 14.8 (4.5) | 1.75 (0.46) |
| Nap 5 | 11.6 (6.5) | 1.75 (0.29) | 1.79 (0.36) | 1.00 (0.58) | 14.6 (5.3) | 1.86 (0.47) |
Notes:
*
Significantly different from all other naps by analysis of variance for repeated measures (df =149;
a
F ratio =3.8–4.3;
b
F ratio >6.0) and Tukey’s test;
+
Significantly different from naps 1, 2, and 5 (df =149).
Abbreviations: SOL, sleep onset latency; ORP, odds ratio product.