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Table 1 Characteristics of controls and breast cancer cases.

From: Analysis of polymorphisms in the circadian-related genes and breast cancer risk in Norwegian nurses working night shifts

Parameter Cases (n = 563) Controls (n = 619) Pvalue
Age (yr)a    0.51b
   Mean (SD) 52.40 (7.88) 52.37 (8.18)  
   Median 50 55  
   Min/max 34/70 34/70  
Selection period    
   1996 to 1999/2000 to 2007 (n) 195/368 221/398 0.72c
Breast cancer in first-degree familyd (n) 557 615  
   Yes/no 104/453 54/561 <0.001c
Hormone therapy in past 2 yre (n) 552 605  
   Yes/no 127/425 121/484 0.22c
Alcohol usef n = 563 n = 619  
   Yes/no 43/520 37/582 0.26c
Children (n) 563 619  
   0/≥1 77/486 81/538 0.80c
  1. aAge at selection for controls and age at diagnosis for cases. bDerived from Mann-Whitney U-test for two independent samples (two-sided) assuming the medians are the same across cases and controls. cPearson's χ2 test (two-sided). d Cancer in sister or mother. eHormone therapy among postmenopausal women only. fAlcohol consumption at least twice weekly.