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 3 The combination of body mass index (BMI) and leisure-time physical activity/exercise in relation to risk of acute myocardial infarction. All cases and all controls.

	BMI < 20			20 ≤ BMI < 25			25 ≤ BMI < 30			BMI ≥ 30
Leisure-time physical activity/exercise	cases/controls	OR	95% CI	cases/controls	OR	95% CI	cases/controls	OR	95% CI	cases/controls	OR	95% CI
All
Very little, occasional walks^¶	57/42	1.50	0.97–2.34	326/394	1*		401/423	1.19	0.96–1.46	211/178	1.55	1.20–2.01
Now and then, once per week	18/24	1.09	0.57–2.08	141/343	0.56	0.44–0.73	214/330	0.88	0.69–1.11	63/73	1.20	0.82–1.76
Twice per week or more	6/13	0.62	0.23–1.68	79/263	0.44	0.32–0.59	103/181	0.79	0.59–1.06	35/27	1.85	1.07–3.18
Men
Very little, occasional walks^†	21/24	0.88	0.47–1.66	217/238	1		290/303	1.13	0.88–1.45	121/98	1.47	1.05–2.05
Now and then, once per week	9/10	1.20	0.47–3.08	96/206	0.57	0.42–0.79	165/232	0.90	0.68–1.19	41/43	1.20	0.74–1.94
Twice per week or more	3/8	0.56	0.14–2.18	61/203	0.41	0.29–0.59	90/138	0.85	0.61–1.19	25/20	1.70	0.90–3.22
Women
Very little, occasional walks^†	36/18	2.40	1.25–4.62	109/156	1		111/120	1.32	0.91–1.93	90/80	1.65	1.09–2.48
Now and then, once per week	9/14	1.02	0.40–2.58	45/137	0.53	0.34–0.82	49/98	0.77	0.49–1.20	22/30	1.21	0.64–2.28
Twice per week or more	3/5	0.62	0.14–2.80	18/60	0.49	0.26–0.90	13/43	0.50	0.25–1.01	10/7	2.11	0.74–6.02

OR-odds ratio; CI-confidence interval
* The normal-weight (20 ≤ BMI < 25) and sedentary group was used as the reference category in all analyses.
^¶ Adjusted for age, hospital catchment area, socioeconomic status, smoking and sex
^† Adjusted for age, hospital catchment area, socioeconomic status and smoking

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