Table 2: Logistic regression analysis for correlation of various risk factors with development of recurrent disease.

CharacteristicNumber with recurrence (%)Univariate P valueRelative risk (95% CI)Multivariate P value

Age
 ≥45 years10/207 (4.8)
 <45 years30/200 (15.0)0.042NS
Gender
 Male7/86 (8.1)
 Female33/321 (10.3)0.248NS
Multifocal tumor
 Yes20/188 (10.6)0.462NS
 No20/219 (9.1)
Capsular invasion
 Yes15/126 (11.9)0.389NS
 No25/281 (8.9)
Vascular Invasion
 Yes3/14 (21.4)0.823NS
 No37/393 (9.4)
Soft tissue invasion
 Yes8/68 (11.8)0.937NS
 No32/339 (9.4)
Positive surgical margin
 Yes8/73 (11.0)0.654NS
 No32/334 (9.6)
Positive lymph nodes
 Yes19/153 (12.4)0.42662.3 ( 1 . 2 - 4 . 6 )0.0150
 No21/252 (8.3)
Tumor size
 >0.8 cm25/132 (18.9)0.01042.1 ( 1 . 1 - 4 . 1 )0.0250
 ≤0.8 cm15/275 (5.5)
I-131 therapy
 No20/51 (39.2)<0.00018.6 ( 4 . 4 - 1 7 . 1 )<0.0001
 Yes20/349 (5.7)