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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