Table 1.
Dip test of unimodality in spindle frequency distribution across AHI groups, scalp locations and night sections
| | |||||||
|---|---|---|---|---|---|---|---|
| |
|
Non-OSA (7) |
|
Mild OSA (11) |
|
Mod OSA (10) |
|
| |
|
Dip value |
P-value |
Dip value |
P-value |
Dip value |
P-value |
| (sample size) | (sample size) | (sample size) | |||||
| Location |
Night Section |
|
|
|
|
|
|
| Frontal |
I |
0.03 (334) |
0.81 |
0.03 (465) |
0.97 |
0.03 (423) |
0.91 |
| |
II |
0.04 (250) |
0.98 |
0.03 (439) |
0.99 |
0.03 (390) |
0.90 |
| |
III |
0.03 (324) |
0.91 |
0.03 (446) |
0.99 |
0.03 (279) |
0.88 |
| Central |
I |
0.03 (326) |
0.86 |
0.03 (426) |
0.94 |
0.03 (472) |
0.98 |
| |
II |
0.03 (296) |
0.92 |
0.02 (456) |
0.73 |
0.04 (472) |
>0.99 |
| |
III |
0.02 (366) |
0.79 |
0.03 (486) |
0.99 |
0.04 (351) |
>0.99 |
| Parietal |
I |
0.03 (383) |
0.94 |
0.03 (386) |
0.96 |
0.03 (413) |
0.96 |
| |
II |
0.03 (438) |
0.99 |
0.02 (460) |
0.93 |
0.03 (415) |
0.99 |
| III | 0.03 (377) | 0.91 | 0.02 (489) | 0.65 | 0.06 (327) | >0.99 | |
AHI, Apnea-Hypopnea Index; Mod, moderate OSA; sample size, number of sleep spindles under study; Location, scalp EEG topography; total, (I+II+III) sample; I, II and III, initial, middle and final night sections, respectively. Bold indicates non-unimodal distributions at the 0.9 probability level. Frequency distributions were non-unimodal in the large majority (78%) of comparisons.