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Table 3 Univariate and multivariate analysis of dosimetric variables

From: Development of a normal tissue complication probability (NTCP) model for radiation-induced hypothyroidism in nasopharyngeal carcinoma patients

    Univariate Multivariate
Variables mean SD p value p value OR 95% CI
Volume (cc) 17.324 8.403 0.703    
Dmin (Gy) 19.579 12.768 0.016    
Dmean (Gy) 42.417 10.145 0.001    
Dmax (Gy) 65.500 5.819 0.536    
Vx(%)
 V10 91.111 16.341 0.124    
 V15 88.863 19.032 0.128    
 V20 86.660 21.072 0.093    
 V25 84.135 23.041 0.070    
 V30 80.583 25.409 0.038    
 V35 74.270 25.425 0.011    
 V40 62.308 23.050 0.001    
 V45 50.496 21.220 0.000    
 V50 38.915 19.477 0.000 0.000 1.051 1.027–1.076
 V55 24.598 16.243 0.000    
 V60 12.111 12.856 0.006    
 V30cc 14.044 8.133 0.730    
 Pmean (Gy) 30.366 22.712 0.072    
 Pmax (Gy) 37.856 23.719 0.054 0.007 0.974 0.956–0.993
  1. Abbreviation: SD standard deviation, OR odds ratio, CI confidence interval