Table 2.
Characteristics of REGARDS accelerometer study participants (n=7,985) by mean sedentary bout length quartile.
| Variable | Quartile 1 (n=1996) |
Quartile 2 (n=1996) |
Quartile 3 (n=1997) |
Quartile 4 (n=1996) |
P-Trend |
|---|---|---|---|---|---|
| Baseline Data* | |||||
| Age | 59.9 (7.4) | 62.4 (7.8) | 64.0 (8.0) | 67.8 (8.8) | <0.001 |
| Male (%) | 38.2 | 45.2 | 48.4 | 51.7 | <0.001 |
| Black race (%) | 31.1 | 27.9 | 30.9 | 35.6 | <0.001 |
| Region of Residence† (%) | <0.001 | ||||
| Non-belt/buckle | 41.3 | 44.9 | 46.1 | 49.9 | |
| Stroke buckle | 22.6 | 22.3 | 22.2 | 18.4 | |
| Stroke belt | 36.1 | 32.8 | 26.0 | 31.7 | |
| Education (%) | 0.35 | ||||
| Less than High School | 5.4 | 5.6 | 5.1 | 8.8 | |
| High School Graduate | 24.7 | 20.4 | 21.9 | 22.3 | |
| Some College | 29.1 | 25.5 | 26.7 | 25.8 | |
| College graduate | 40.8 | 48.5 | 46.3 | 43.1 | |
| Current Smoker (%) | 12.7 | 9.5 | 9.7 | 10.7 | 0.062 |
| Alcohol Drinking‡ (%) | <0.001 | ||||
| None | 55.8 | 52.9 | 54.4 | 61.0 | |
| Moderate | 38.0 | 42.4 | 41.6 | 35.0 | |
| Heavy | 6.2 | 4.7 | 4.0 | 4.0 | |
| Body Mass Index (kg/m2) | 27.2 (4.9) | 28.2 (5.3) | 29.1 (5.7) | 30.0 (6.4) | <0.001 |
| Diabetes (%) | 8.6 | 12.6 | 14.1 | 22.9 | <0.001 |
| Hypertension (%) | 42.1 | 47.3 | 54.0 | 63.3 | <0.001 |
| Dyslipidemia (%) | 51.3 | 56.1 | 60.1 | 63.6 | <0.001 |
| eGFR < 60 mL/min/1.73 m2 (%) | 2.1 | 6.2 | 6.8 | 13.0 | <0.001 |
| Atrial fibrillation (%) | 5.4 | 5.6 | 7.1 | 8.3 | <0.001 |
| History of CHD (%) | 9.8 | 10.9 | 12.3 | 19.0 | <0.001 |
| History of Stroke (%) | 2.1 | 2.5 | 3.3 | 6.2 | <0.001 |
| Accelerometer Data | |||||
| Age at time of accelerometer testing | 66.0 (7.6) | 68.6 (7.9) | 70.2 (8.1) | 74.3 (8.9) | <0.001 |
| Season accelerometer worn§ (%) | 0.55 | ||||
| Summer | 24.8 | 25.7 | 22.8 | 26.4 | |
| Autumn | 26.1 | 25.1 | 24.8 | 24.0 | |
| Winter | 25.2 | 24.6 | 24.2 | 25.3 | |
| Spring | 23.9 | 24.0 | 28.2 | 24.3 | |
| Wear Time (min/day) | 855.9 (105.6) | 871.6 (109.5) | 871.2 (117.8) | 862.8 (140.7) | <0.001 |
| Valid wear days (%) | 0.34 | ||||
| 4–5 days | 1.2 | 1.1 | 1.4 | 1.5 | |
| 6–7 days | 98.8 | 98.9 | 98.6 | 98.5 | |
| Sedentary Time‖ (min/day) | 649.3 (58.3) | 717.6 (40.7) | 766.0 (36.6) | 834.5 (42.0) | <0.001 |
| Sedentary Bout Duration¶ (min/bout) | 6.5 (0.9) | 8.7 (0.5) | 10.9 (0.8) | 19.6 (12.7) | <0.001 |
| LIPA** (min/day) | 274.7 (58.2) | 211.0 (42.1) | 165.7 (36.7) | 101.0 (42.7) | <0.001 |
| MVPA†† (min/day) | 20.0 (21.1) | 16.1 (18.1) | 11.9 (16.0) | 4.9 (10.1) | <0.001 |
Data presented as mean (standard deviation) or percent.
CHD, coronary heart disease; LIPA, light intensity physical activity; MVPA, moderate or vigorous intensity physical activity.
Demographic data, cardiovascular risk factors, and chronic disease status/medical history data were collected at the original baseline (see Appendix Methods).
Stroke buckle: coastal plain region of North Carolina, South Carolina, and Georgia; stroke belt: remainder of North Carolina, South Carolina, and Georgia, plus Alabama, Mississippi, Tennessee, Arkansas, and Louisiana.
None: 0 drinks per week; Moderate: >0 to 14 drinks per week for males and >0 to 7 drinks per week for females; Heavy: >14 drinks per week for males and >7 drinks per week for females.
Summer: June 21-September 20; Autumn September 21-December 20; Winter: December 21-March 20; Spring: March 21-June 20.
Minutes in which the accelerometer registered <50 counts per minute. Corrected for wear time and expressed as the estimated minutes/day of sedentary time given a standardized 16 hours of accelerometer wear (see Methods).
sedentary bout is defined as consecutive minutes in which the accelerometer registered <50 counts per min.
Minutes in which the accelerometer registered 50–1064 counts per minute.
Minutes in which the accelerometer registered ≥1065 counts per minute.
The quartile cutoff points were <7.7, ≥7.7 to <9.6, ≥ 9.6 to <12.4, and ≥12.4 min/bout.