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Table 4 Relationships between the ESS and weighted ESS scores and the AHI

From: Weighted Epworth sleepiness scale predicted the apnea-hypopnea index better

Features

Cut-off values

Derivation cohort

(n = 756)

Validation cohort

(n = 810)

Total

Coincidence with corresponding AHI (%)

Total

Coincidence with corresponding AHI (%)

ESS

 NDS

0–10

354

108 (30.5)

438

88 (20.1)

 Mild EDS

11–12

136

44 (32.4)

92

8 (8.7)

 Moderate EDS

13–15

110

68 (61.8)

96

32 (33.3)

 Severe EDS

16–24

156

152 (97.4)

184

178 (96.7)

Weighted ESS

 NDS

0–14

124

100 (80.6)

196

88 (44.9)

 Mild EDS

15–19

194

104 (53.6)

122

48 (39.3)

 Moderate EDS

20–29

252

142 (56.3)

242

152 (62.8)

 Severe EDS

30–40

186

184 (98.9)

250

242 (96.8)

  1. NOTE: ESS Epworth sleepiness scale. AHI Apnea-hypopnea index. NDS Normal daytime sleepiness. EDS Excessive daytime sleepiness