TABLE 6.

Hazard ratios for total CVD events per 1-minute increment of maximal exercise duration according to cardiovascular disease risk factor categories in women, Aerobics Center Longitudinal Study, Dallas, Texas, 1971-2004

Risk Factor	N	Events	HR‡	95% CI‡	p value	HR§	95% CI§	p value
Age, years
<55	4,864	93	0.94	0.89, 0.99	0.03	0.96	0.91, 1.02	0.23
≥55	1,045	66	0.96	0.89, 1.04	0.30	0.98	0.90, 1.06	0.61
Current smoker
No	5,358	136	0.96	0.92, 1.01	0.14	0.98	0.93, 1.03	0.49
Yes	551	23	0.89	0.77, 1.01	0.07	0.87	0.75, 1.00	0.05
Family history of CVD
No	4,820	132	0.95	0.91, 1.00	0.05	0.97	0.92, 1.02	0.23
Yes	1,089	27	0.93	0.83, 1.04	0.22	0.97	0.85, 1.10	0.61
Exercise ECG responses
Normal	5,604	138	0.95	0.90, 0.99	0.03	0.96	0.91, 1.01	0.11
Abnormal	305	21	1.00	0.85, 1.17	0.97	1.12	0.93, 1.34	0.24
Body mass index, kg/m2
18.5-24.9	4,644	119	0.94	0.89, 0.94	0.01	0.95	0.90, 1.01	0.07
≥25	1,265	40	1.02	0.91, 1.14	0.80	1.03	0.92, 1.16	0.60
Hypertension
No	4,846	94	0.97	0.92, 1.03	0.33	1.00	0.94, 1.06	0.93
Yes	1,063	65	0.94	0.87, 1.01	0.07	0.92	0.85, 0.99	0.04
Diabetes
No	5,732	152	0.94	0.90, 0.99	0.01	0.96	0.91, 1.01	0.08
Yes	177	7	1.09	0.82, 1.44	0.57	1.15	0.73, 1.79	0.55
Total cholesterol
<6.20 mmol/L (240 mg/dl)	5,091	119	0.93	0.89, 0.98	0.009	0.95	0.90, 1.01	0.07
≥6.20 mmol/L (240 mg/dl)	818	40	0.99	0.90, 1.09	0.86	1.03	0.93, 1.13	0.63

Abbreviations, †, ‡ and § are the same as in Table 5.