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Table 1 Hematological parameters of study participants by Mt5178 C/A genotype

From: Longevity-associated mitochondrial DNA 5178 C/A polymorphism modulates the effects of coffee consumption on erythrocytic parameters in Japanese men: an exploratory cross-sectional analysis

  Mt5178C Mt5178A P value
  N = 266 N = 170  
Age (y)a 54.5 ± 7.7 53.6 ± 7.8 0.243
Body mass index (kg/m2)a 23.2 ± 2.8 23.5 ± 2.6 0.163
Red blood cell count (104/μL)a 480 ± 37 487 ± 41 0.066
Hematocrit (%)a 43.8 ± 3.0 44.3 ± 2.8 0.092
Hemoglobin (g/dL)a 15.0 ± 1.2 15.1 ± 1.0 0.199
Mean corpuscular volume (fl)a 91.4 ± 4.3 91.2 ± 4.6 0.644
Mean corpuscular hemoglobin (pg)a 31.2 ± 1.7 31.1 ± 1.7 0.487
Mean corpuscular hemoglobin concentration (g/dL)a 34.2 ± 0.8 34.1 ± 0.8 0.529
White blood cell count (102/μL)b 56.8 ± 14.6 60.5 ± 18.3 0.026
Platelet count (104/μL)a 22.1 ± 4.8 22.6 ± 5.3 0.322
Coffee consumption (<1 cup per day/1 to 3 cups per day/≥4 cups per day) (%)c 44.8/46.2/9.0 36.5/51.2/12.3 0.188
Current smokers (%)c 42.1 41.8 0.944
Alcohol consumption (non- or ex-/occasionally/daily) (%)c 18.4/35.0/46.6 12.9/40.0/47.1 0.269
Green tea consumption (<1 cup per day/1 to 4 cups per day/≥5 cups per day) (%)c 22.6/41.3/36.1 20.0/45.3/34.7 0.689
  1. Age, body mass index, red blood cell counts, hematocrit, hemoglobin, mean corpuscular volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, white blood cell counts, and platelet counts are given as means ± SD. All P values depict significance of differences between Mt5178C and Mt5178A. aStudent’s t-test, bWelch’s t-test, cchi-squared test.