The effect of leisure-time physical activity on the risk of acute myocardial infarction depending on Body Mass Index: a population-based case-control study

Table 2 Body mass index (BMI) and leisure-time physical activity in relation to risk of acute myocardial infarction.

	All cases			Non-fatal cases
	cases/controls	OR	95% CI	cases/controls	OR	95% CI
Body Mass Index (BMI)
All
BMI < 20^¶	84/79	1.76	1.26–2.48	47/79	1.31	0.89–1.94
20 ≤ BMI < 25	562/1017	1*		435/1017	1
25 ≤ BMI < 30	736/939	1.43	1.23–1.65	633/939	1.57	1.34–1.84
BMI ≥ 30	317/279	2.10	1.72–2.56	260/279	2.23	1.80–2.75
Men
BMI < 20^†	34/42	1.30	0.80–2.12	22/42	1.08	0.62–1.87
20 ≤ BMI < 25	386/659	1		302/659	1
25 ≤ BMI < 30	557/675	1.44	1.21–1.72	485/675	1.58	1.31–1.90
BMI ≥ 30	193/162	2.07	1.61–2.67	155/162	2.08	1.59–2.72
Women
BMI < 20^†	50/37	2.29	1.39–3.76	25/37	1.55	0.87–2.76
20 ≤ BMI < 25	176/358	1		133/358	1
25 ≤ BMI < 30	179/264	1.37	1.03–1.81	148/264	1.52	1.12–2.05
BMI 124/117 30	124/117	2.13	1.53–2.96	105/117	2.50	1.76–3.55
Leisure-time physical activity
All
Very little, occasional walks^¶	1031/1037	1^#		760/1037	1
Now and then, once per week	440/770	0.64	0.55–0.74	387/770	0.74	0.63–0.87
Twice per week or more	225/484	0.54	0.45–0.65	197/484	0.62	0.51–0.76
Men
Very little, occasional walks^†	668/663	1		511/663	1
Now and then, once per week	315/491	0.70	0.58–0.84	277/491	0.79	0.65–0.96
Twice per week or more	181/369	0.57	0.46–0.71	155/369	0.63	0.50–0.79
Women
Very little, occasional walks^†	363/374	1		249/374	1
Now and then, once per week	125/279	0.52	0.40–0.68	110/279	0.64	0.48–0.86
Twice per week or more	44/115	0.44	0.30–0.65	42/115	0.58	0.39–0.87

OR-odds ratio; CI-confidence interval
* Normal-weight was used as reference category.
^# Being sedentary was used as reference category.
^¶ Adjusted for age, hospital catchment area, socioeconomic status, smoking and sex
^† Adjusted for age, hospital catchment area, socioeconomic status and smoking

ISSN: 1471-2458