Table 4 Hazard ratio for breast cancer risk in relation to level of serum GGT (adjusted by age, age at first birth/nulliparity, age at menarche, height and weight)

From: γ-Glutamyl transferase and breast cancer risk

 

All

 

HR (95% CI)

P-value

N (cases)

1803 (96)

 

GGT in quartiles

  

 Q1 (⩽8.0 IU l−1)

1.00

0.011

 Q2 (8.1–11.0 IU l−1)

1.55 (0.81, 2.97)

 

 Q3 (11.1–14.0 IU l−1)

2.41 (1.33, 4.35)

 

 Q4 (>14.0 IU l−1)

2.17 (1.19, 3.93)

 

GGT by median value

  

 Below median (11.0 IU l−1)

1.00

0.004

 Above median

1.88 (1.23, 2.87)

 

GGT by normal range

  

 In normal range (⩽40 IU l−1)

1.00

0.003

 Above normal range

2.50 (1.36, 4.60)

 
  1. Abbreviation: CI=confidence interval; HR=hazard ratio; GGT=γ-glutamyl transferase; Q1, first quartile; Q2, second quartile; Q3, third quartile; Q4, fourth quartile. Values in bold type represent significant P-values (P<0.05)
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