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Table 2 Summary statistics and Pearson correlation coefficients of PSS scores at each visit

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

Visit

n subjects

Mean (SD)

Visit 1

Visit 2

Visit 3

Visit 4

1

987

26.8 (6.8)

1.00

0.44

0.24

0.20

2

699

26.4 (6.7)

 

1.00

0.32

0.36

3

410

25.3 (7.6)

  

1.00

0.34

4

148

25.6 (8.2)

   

1.00

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Environmental Health

ISSN: 1476-069X