Table 1.

Characteristics of the study population by hours per week of physical activity, The Sister Study

<1 hour per week1–6 hours per week≥7 hours per week
N = 17,192 (33.9%)N = 29,046 (57.3%)N = 4,438 (8.8%)
N (%)N (%)N (%)
Age at baseline (mean, SD)54.9 (9.0)55.8 (9.0)57.3 (8.6)
Race/ethnicity
 Non-Hispanic white13,601 (79.1)24,897 (85.7)3,892 (87.7)
 Non-Hispanic black1,890 (11.0)2,284 (7.9)274 (6.2)
 Hispanic1,197 (7.0)1,162 (4.0)144 (3.3)
 Other503 (2.9)697 (2.4)126 (2.8)
 Missing1 (–)6 (–)2 (–)
Highest level of education
 Less than high school361 (2.1)232 (0.8)30 (0.7)
 High school graduate3,259 (19.0)3,472 (12.0)416 (9.4)
 Some college6,578 (38.3)9,334 (32.1)1,208 (27.2)
 College degree or higher6,993 (40.7)16,004 (55.1)2,783 (62.7)
 Missing1 (–)4 (–)1 (–)
Residence type
 Urban3,325 (19.4)5,635 (19.4)908 (20.5)
 Suburban6,140 (35.8)11,532 (39.7)1,757 (39.7)
 Small town3,632 (21.2)6,112 (21.1)990 (22.4)
 Rural3,996 (23.3)5,652 (19.5)758 (17.1)
 Other54 (0.3)73 (0.3)16 (0.4)
 Missing45 (–)42 (–)9 (–)
Parity
 Nulliparous2,825 (16.4)5,332 (18.4)1,017 (23.0)
 Parous14,361 (83.6)23,694 (81.6)3,413 (77.0)
 Missing6 (–)20 (–)8 (–)
Alcohol use
 Never834 (4.9)980 (3.4)122 (2.8)
 Former3,357 (19.6)3,792 (13.1)550 (12.4)
 Current, <1 drink/day11,150 (65.0)20,037 (69.1)2,945 (66.5)
 Current, 1+ drink/day1,822 (10.6)4,202 (14.5)811 (18.3)
 Missing29 (–)35 (–)10 (–)
Smoking status
 Never9,511 (55.3)16,490 (56.8)2,451 (55.2)
 Past5,557 (32.3)10,741 (37.0)1,763 (39.7)
 Current2,123 (12.4)1,811 (6.2)224 (5.1)
 Missing1 (–)4 (–)0 (–)