Table 1.

Characteristics of the acute myocardial infarction hospitalisation in Gothenburg, Sweden during 1 January 1985–31 December 2010

	No. cases	%
Total	28215	100.0
Sex
Male	16627	58.9
Female	11588	41.1
Age (years)
23 − 35	62	0.2
36 − 55	2459	8.7
56 − 65	3951	14.0
66 − 75	7390	26.2
76 − 84	9122	32.3
85 − 102	5231	18.5
Seasonal period
Warm	13381	47.4
Cold	14834	52.6
Time period
1985 − 2000	18264	64.7
1990 − 2000	12109	42.9
2001 − 2010	9951	35.3

Warm period: April − September, cold period: October − March.

Time period: Air pollution emissions in Europe changed during the last two decades, with large reductions in SO_x, NO_x and NH_x emissions during the late 1990s [38]. PM₁₀ and PM_rest available from 1990–2010.