Table 2.
Between-subjects correlations with all sleep stages
| Sleep stage in % | Correlation with % memory retention | ||
|---|---|---|---|
| Intervention condition | Non-intervention condition | Difference between correlation coefficients | |
| N1 | r(150) = –0.143, p = 0.078, BF01 = 3.32 | r(148) = –0.059, p = 0.472, BF01 = 11.94 | z = –0.73, p = 0.233 |
| N2 | r(152) = 0.183, p = 0.023, BF01 = 1.19 | r(151) = –0.057, p = 0.485, BF01 = 12.23 | z = 2.101, p = 0.018 |
| SWS | r(152) = 0.020, p = 0.809, BF01 = 15.20 | r(150) = 0.110, p = 0.176, BF01 = 6.24 | z = –0.783, p = 0.217 |
| REM | r(149) = 0.155, p = 0.058, BF01 = 2.59 | r(149) = 0.230, p = 0.005*, BF01 = 0.28 | z = –0.67, p = 0.251 |
| WASO | r(150) = –0.211, p = 0.009*, BF01 = 0.52 | r(148) = –0.132, p = 0.107, BF01 = 4.24 | z = –0.701, p = 0.242 |
| TST (in minutes) | r(148) = 0.142, p = 0.083, BF01 = 3.45 | r(148) = 0.039, p = 0.635, BF01 = 13.81 | z = 0.891, p = 0.186 |
Note. The table summarizes the results for the exploratory analysis on the correlation between the single sleep stages in % and memory retention across the nap separately for the two conditions. The difference between the correlation coefficients was analyzed by Fisher’s z-transformation. Bonferroni corrected p value is p = 0.01 (p = 0.05 divided by 5, see statistical analysis). BF < 0.3: moderate evidence for H1, BF < 1: anecdotal evidence for H1, BF < 3: anecdotal evidence for H0, BF < 10: moderate evidence for H0, BF < 30: strong evidence for H0.