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Table 2 Comparisons of measured variables and calculation of odds ratio: in univariate analysis

From: Acne keloidalis nuchae and hypertension in black subjects: a case–control study

Variables Cases (n = 101) Controls (n = 202) p-value
Mean age (years) ± standard deviation 34.91 ± 10.7 35.62 ± 11.2 NC
Mean BMI (Kg/m2) ± standard deviation 27.0 ± 4.5 23.7 ± 2.9 < 0.001 T
Mean systolic blood pressure (mmHg) ± standard deviation 126.7 ± 22.50 115.7 ± 14.24 < 0.001 T
Mean diastolic blood pressure (mmHg) ± standard deviation 83.07 ± 15.86 75.74 ± 13.06 0.001 T
BMI (kg/m2), n (%)
 < 25 36 (35.6) 147 (72.8)
 ≥ 25 65 (64.4) 55 (27.2) < 0.001a
Blood pressure, n (%)
 Systolic hypertension
  No 77 (76.2) 186 (92.1) 0.009a
  Yes 24 (23.8) 16 (7.9)  
 Diastolic hypertension
  No 67 (66.3) 143 (70.8) 0.461a
  Yes 34 (33.7) 59 (29.2)  
  1. NC: pairing variable of the two groups; BMI: body mass index; T: student test for paired samples; aMcNemar's test