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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)