Factors associated with OSA severity upon multiple linear regression models stratified by age.

Male and female subjects were stratified into four and three groups in terms of centralized covariant tendencies between age and OSA severity determined by restricted cubic spline analysis, the risk factors assciated with OSA severity (AHI) were screened by using multiple linear regression models for each age group. The impact of each factor was expressed as an unstandardized partial regression coefficient (B) with 95% confidence interval. The B for Age or BMI indicates the unstandardized partial regression coefficient for 1 unit increased. The B for WHR indicates the unstandardized partial regression coefficient for 0.1 unit increased.Abbreviations: BMI, Body mass index; WHR, waist circumference/hip circumference ratio; AHI, apnea-hypopnea index.Factors associated with OSA severity upon multiple linear regression models stratified by age.