The relationship between upper airway collapse and the severity of obstructive sleep apnea syndrome: a chart review

Table 2 Mean AHI according to the level and degree of collapse

Velopharynx collapse	n (%)	Mean AHI (events per hour)	Standard deviation (events per hour)
Minimal	30 (6)	17	11
Moderate	41 (9)	25	15
Significant	392 (85)	27	21
r = 0.069 (95 % CI; −0.022, 0.16)
Base of Tongue Collapse
Minimal	144 (28)	19	12
Moderate	187 (37)	24	19
Significant	175 (35)	33	23
r = 0.26 (95 % CI; 0.18, 0.34)
Lateral Pharyngeal Wall Collapse
Minimal	158 (41)	20	16
Moderate	109 (28)	25	19
Significant	120 (31)	33	25
r = 0.22 (95 % CI; 0.12, 0.31)

This table shows the mean AHI value at each degree of UA collapse (minimal = airway collapse of 0-50 %; moderate = airway collapse of 51–75 %; severe = airway collapse of 76–100 %). r and CI values are marked after each analysis

ISSN: 1916-0216