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Table 1 Characteristics of 987 participants at the baseline visit

From: Associations between air pollution and perceived stress: the Veterans Administration Normative Aging Study

Characteristics n (%)*
Total number of visits  
 One 288 (29)
 Two 289 (29)
 Three 262 (27)
 Four 148 (15)
Age, mean (SD) 69.1 (7.0)
Race  
 White 972 (98)
 Black 15 (2)
Years of education, mean (SD) 14.8 (2.9)
Use of anti-depressant medication 27 (3)
Physical activity (METS/week), mean (SD) 17.0 (21.7)
 Missing information on physical activity 25 (3)
  1. Abbreviations:SD standard deviation, METS metabolic equivalent of task score.
  2. *Unless otherwise noted.