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Table 1 Demographic characteristics of PD cases and controls

From: Association of Nrf2-encoding NFE2L2 haplotypes with Parkinson's disease

Parameter Parkinson Control p-value1
Swedish cases and controls    
   Number of subjects 165 190  
   Age at sampling (years) 68.2 ± 8.8 69.1 ± 9.3 0.698
   Age at onset (years) 59.0 ± 10.2 --- ---
   Sex (Female) 71 (43.0) 120 (63.2) <0.001
(Male) 94 (57.0) 70 (36.8)  
   Current smoker 9 (8.7) 13 (8.3) 0.897
   Ever smoked 38 (36.9) 81 (51.6) 0.020
   Parkinson's disease in family 40 (24.8) 18 (9.5) <0.001
   Alzheimer's disease in family 7 (4.3) 8 (4.3) 0.976
Polish cases and controls    
   Number of subjects 192 192  
   Age at sampling (years) 63.7 ± 10.9 72.9 ± 9.9 <0.001
   Age at onset (years) 55.2 ± 10.9 --- ---
   Sex (Female) 75 (39.1) 75 (39.1) 1.000
(Male) 117 (60.9) 117 (60.9)  
  1. Data are presented as absolute numbers (%) or mean ± SD. 1p-values are calculated with χ2-test for categorical parameters and Mann-Whitney U test for continuous parameters.