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Table 2 Group comparison according to polysomnographic parameters

From: The platelet-to-lymphocyte ratio reflects the severity of obstructive sleep apnea syndrome and concurrent hypertension

  Control (n = 61) Mild OSAS (n = 67) Moderate OSAS (n = 61) Severe OSAS (n = 101) ANOVA p
AHI 1.91 ± 1.69 9.14 ± 3.03* 21.5 ± 4.98*,+ 72.5 ± 51.7*,+ <0.001
Sleep efficiency, % 81.0 ± 9.14 81.0 ± 9.91 82.0 ± 10.3 77.1 ± 13.1* 0.026
Total sleep time, min 322.8 ± 44.8 298.7 ± 60.4 292.2 ± 62.4 257.0 ± 78.2* <0.001
Stage 1, min 58.2 ± 32.0 39.5 ± 37.9 48.2 ± 53.7 73.5 ± 59.8* 0.006
Stage 2, min 139.6 ± 71.8 103.2 ± 67.3 125.7 ± 69.6 70.9 ± 43.30* <0.001
Baseline SaO2, % 97.3 ± 0.96 95.5 ± 1.77 93.9 ± 3.07 92.0 ± 4.87* <0.001
Lowest SaO2, % 91.3 ± 3.09 88.4 ± 3.82 81.3 ± 8.68* 79.0 ± 8.87* <0.001
ESS 8.7 ± 4.6 8.9 ± 5.2 10.4 ± 5.9 11.6 ± 6.0* 0.029
  1. AHI: apnea-hypopnea index; ESS: Epworth sleepiness scale
  2. *p < 0.05 vs. control group, +p < 0.05 vs. mild OSAS group