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Table 1 Summary of the demographic characteristics of the cohort

From: Evaluation of the effect of ambrisentan on digital microvascular flow in patients with systemic sclerosis using laser Doppler perfusion imaging: a 12-week randomized double-blind placebo controlled trial

   Total Ambrisentan Placebo
Factor Level Number Number (%) Number (%)
Gender      
  Female 16 13 86.7 3 60.0
  Male 4 2 13.3 2 40.0
Age       
  Mean (SD) 20 15 50.6 (12.8) 5 46.8 (10.5)
Race      
  Non-White 5 4 26.7 1 20.0
  White 15 11 73.3 4 80.0
Ethnicity      
  Non-Hispanic 20 15 100.0 5 100.0
Smoking       
  No 20 15 100.0 5 100.0
Scleroderma       
  Limited 20 15 100.0 5 100.0
  1. SD = standard deviation.