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Table 1 Demographical statistics of study population (deaths = 157,197) in Eastern Massachusetts, 1995-2002

From: Modifiers of short-term effects of ozone on mortality in eastern Massachusetts - A casecrossover analysis at individual level

Variable

No. (%) of the whole period

Subjects = 157,197

No. (%) between May-Sept

Subjects = 60,302

Age

  

   35-64

25958 (16.51)

10439 (17.31)

   65-74

29619 (18.84)

11709 (19.42)

   75-84

48757 (31.02)

18581 (30.81)

   85 or older

52863 (33.63)

19573 (32.46)

Education

  

   ≤ 8 years

13516 (8.60)

5151 (8.54)

   9-12

101083 (64.30)

38729 (64.23)

   13-16

30888 (19.65)

11929 (19.78)

   17 or more

9844 (6.26)

3774 (6.26)

   Unknown

1866 (1.19)

719 (1.19)

Marital

  

   Never married

22051 (14.03)

5151 (13.79)

   Married or separated

56203 (35.75)

38729 (36.54)

   Widowed

66291 (42.17)

11929 (41.38)

   Divorced

12383 (7.88)

3774 (8.12)

   Unknown

269 (0.17)

112 (0.19)

Cause of death

  

   CVD

59354 (37.76)

22585 (37.45)

MI

20705 (13.17)

7853 (13.02)

Stroke

1019 (6.18)

3883 (6.44)

Other heart

28458 (18.10)

10849 (17.99)

   Respiratory disease

16751 (10.66)

5697 (9.45)

   Diabetes

3845 (2.45)

1524 (2.53)

   All Other

77247 (49.14)

30496 (50.57)

Gender

  

   Male

69758 (44.38)

27052 (44.86)

   Female

87439 (55.62)

33250 (55.14)

Race

  

   White & non-Hispanic

144646 (92.02)

55348 (91.78)

   Black

8381 (5.33)

3330 (5.52)

   American Indian

54 (0.03)

23 (0.04)

   Hispanic

1289 (0.82)

509 (0.84)

   Asian-Pacific

2184 (1.39)

849 (1.41)

   Others

12 (0.01)

4 (0.01)

   Unkown

631 (0.40)

239 (0.40)