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Table 1 Dip test of unimodality in spindle frequency distribution across AHI groups, scalp locations and night sections

From: Topography-specific spindle frequency changes in Obstructive Sleep Apnea

  

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

  1. 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.