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.

Schönwald et al.

Schönwald et al. BMC Neuroscience 2012 13:89   doi:10.1186/1471-2202-13-89

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