Table 1

General characteristics of lymphoma cases and matched controls

Cases (n = 469)Controls (n = 469)P*
Sex    
Male, n (%) 231 (49.3%) 231 (49.3%)  
Female, n (%) 238 (50.7%) 238 (50.7%)  
Age at recruitment, y 56.6 (8.8) 56.6 (8.8) .55 
BMI 26.9 (4.4) 26.6 (4.2) .26 
Alcohol at recruitment (g/d) 13.7 (18.6) 13.3 (19.5) .78 
Smoking status   .31 
 Never 42.1% 43.7%  
 Former 37.1% 32.5%  
 Current smoker 20.8% 23.8%  
Physical activity   .63 
 Inactive 26.4% 28.6%  
 Moderately inactive 31.1% 27.7%  
 Moderately active 19.0% 21.1%  
 Active 18.3% 18.8%  
 Unknown 5.1% 3.8%  
Education   .40 
 None 8.1% 6.9%  
 Primary school 35.9% 34.3%  
 Technical/professional school 23.4% 22.8%  
 Secondary school 9.9% 14.5%  
 Longer education (including university degree) 19.5% 18.9%  
 Not specified 3.3% 2.6%  
Lymphoma type, n (%)    
 HL 31 (6.6%)   
 B-NHL 418 (89.1%)   
  DLBCL 60 (14.5%)   
  FL 75 (18.1%)   
  CLL 102 (24.6%)   
  MM 109 (26.3%)   
  Other 72 (17.2%)   
 T-NHL 20 (4.3%)   
mtDNA copy number 35.7 (23.9) 30.6 (10.0) .0001 
Cases (n = 469)Controls (n = 469)P*
Sex    
Male, n (%) 231 (49.3%) 231 (49.3%)  
Female, n (%) 238 (50.7%) 238 (50.7%)  
Age at recruitment, y 56.6 (8.8) 56.6 (8.8) .55 
BMI 26.9 (4.4) 26.6 (4.2) .26 
Alcohol at recruitment (g/d) 13.7 (18.6) 13.3 (19.5) .78 
Smoking status   .31 
 Never 42.1% 43.7%  
 Former 37.1% 32.5%  
 Current smoker 20.8% 23.8%  
Physical activity   .63 
 Inactive 26.4% 28.6%  
 Moderately inactive 31.1% 27.7%  
 Moderately active 19.0% 21.1%  
 Active 18.3% 18.8%  
 Unknown 5.1% 3.8%  
Education   .40 
 None 8.1% 6.9%  
 Primary school 35.9% 34.3%  
 Technical/professional school 23.4% 22.8%  
 Secondary school 9.9% 14.5%  
 Longer education (including university degree) 19.5% 18.9%  
 Not specified 3.3% 2.6%  
Lymphoma type, n (%)    
 HL 31 (6.6%)   
 B-NHL 418 (89.1%)   
  DLBCL 60 (14.5%)   
  FL 75 (18.1%)   
  CLL 102 (24.6%)   
  MM 109 (26.3%)   
  Other 72 (17.2%)   
 T-NHL 20 (4.3%)   
mtDNA copy number 35.7 (23.9) 30.6 (10.0) .0001 
*

Paired t test for continues and χ2 test for categorical variables.

Mean (standard deviation).

The copy number of mtDNA in 1 leukocyte (per diploid genome); mean (standard deviation).

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