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Table 1 Basic characteristics and the outcome measures of the sixteen study participants, Mexico City Metropolitan Area, February 2002

From: Traffic-related air pollution exposures and changes in heart rate variability in Mexico City: A panel study

Demographics n(%)
Male 11 (68.8)
Mexican 8 (50)
Smoker 2 (12.5)
Former smoker 4 (25)
Hypertension 1 (6.3)
Age (years)  
 Mean (SD) 34.6 (11.8)
 Median (IQR) 30.5 (16.5)
 Range 22-56
Heart Rate Variability Measures
n = 4436 for all variables (total number of measures across all subjects)
  Mean (SD) Median (IQR) Range
SDNN (msec) 66.6 (28.9) 62.0 (29.9) 4.1-704.9
HF (Hz) 234.4 (458.5) 121.9 (213.5) 0.3-8535.0
LF (Hz) 731.0 (591.4) 592.5 (639.3) 1.0-7155.0
LF/HF 6.7 (6.0) 4.9 (5.8) 0.1-130.6