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Table 2 General characteristics of the ischemic stroke case-control study sample

From: Mitochondrial haplogroup H1 is protective for ischemic stroke in Portuguese patients

Characteristic Controls Cases P-value*
N 499 534  
Sex (n/N, %male) 230/499 (46.1) 336/534 (62.9) < 10-4
Age-at-examination (mean ± SD, years) 62.9 ± 6.9 52.1 ± 9.4 < 10-4
Age-at-onset (mean ± SD, years) - 51.4 ± 9.5 -
Risk factors (n/N, %)    
   Hypertension (> 140–85 mmHg) 183/482 (38.0) 270/478 (56.5) < 10-4
   Hypercholestrolemia (> 200 mg/dL) 309/489 (63.2) 310/496 (62.5) 0.654
   Hypertriglycemia (> 200 mg/dL) 64/411 (15.6) 38/215 (17.7) 0.508
   Diabetes 54/470 (11.5) 88/509 (17.3) 0.007
   Ever smoking 127/481 (26.4) 259/526 (49.2) < 10-4
   Ever drinking 202/474 (42.6) 305/527 (57.9) < 10-4
  1. *P-value of an unpaired Student's t test or a chi-square test for quantitative and qualitative data, respectively. SD: standard deviation.