Table 1. Baseline Characteristics by Quartile of Time Spent in Light PA Among 5861 Women.
| Characteristic | No./Total No. (%)a | P Value | |||
|---|---|---|---|---|---|
| Q1 (Low) | Q2 | Q3 | Q4 (High) | ||
| No. | 1466 | 1465 | 1465 | 1465 | |
| Age, mean (SD), y | 79.9 (6.7) | 78.7 (6.7) | 78.1 (6.6) | 77.4 (6.5) | <.001 |
| Race/ethnicity | |||||
| White | 895 (61.1) | 742 (50.6) | 655 (44.7) | 571 (39.0) | <.001 |
| Black | 399 (27.2) | 490 (33.4) | 524 (35.8) | 553 (37.7) | |
| Hispanic/Latina | 172 (11.7) | 233 (15.9) | 286 (19.5) | 341 (23.3) | |
| BMI, mean (SD) | 30.2 (6.2) | 28.6 (5.5) | 27.5 (5.3) | 26.3 (5.1) | <.001 |
| Highest education | |||||
| High school or less | 277/1454 (19.1) | 287/1455 (19.7) | 287/1449 (19.8) | 325/1464 (22.2) | .26 |
| Some college | 581/1454 (40.0) | 580/1455 (39.9) | 551/1449 (38.0) | 535/1464 (36.5) | |
| College graduate | 596/1454 (41.0) | 588/1455 (40.4) | 611/1449 (42.2) | 604/1464 (41.3) | |
| Current smoker | 48 (3.3) | 38 (2.6) | 28 (1.9) | 27 (1.8) | .04 |
| Alcohol consumption | |||||
| Nondrinker | 544 (37.1) | 474 (32.4) | 480 (32.8) | 467 (31.9) | <.001 |
| <1 Drink/wk | 471 (32.1) | 476 (32.5) | 465 (31.7) | 433 (29.6) | |
| ≥1 Drinks/wk | 301 (20.5) | 383 (26.1) | 404 (27.6) | 442 (30.2) | |
| Unknown | 150 (10.2) | 132 (9.0) | 116 (7.9) | 123 (8.4) | |
| RAND-36 physical function score, mean (SD) | 60.5 (27.7) | 68.2 (25.9) | 73.7 (23.3) | 76.4 (22.4) | <.001 |
| No. of chronic conditionsb | |||||
| None | 340 (23.2) | 356/1464 (24.3) | 376 (25.7) | 410 (28.0) | <.001 |
| 1-2 | 951 (64.9) | 972/1464 (66.4) | 963 (65.7) | 945 (64.5) | |
| ≥3 | 175 (11.9) | 136/1464 (9.3) | 126 (8.6) | 110 (7.5) | |
| Self-rated health | |||||
| Excellent or very good | 690/1461 (47.2) | 727/1458 (49.9) | 793/1460 (54.3) | 818/1458 (56.1) | <.001 |
| Good | 596/1461 (40.8) | 603/1458 (41.4) | 543/1460 (37.2) | 536/1458 (36.8) | |
| Fair or poor | 175/1461 (12.0) | 128/1458 (8.8) | 124/1460 (8.5) | 104/1458 (7.1) | |
| Uses antihypertensive medication | 985 (67.2) | 924 (63.1) | 908 (62.0) | 873 (59.6) | <.001 |
| Uses antilipidemic medication | 620 (42.3) | 641 (43.8) | 549 (37.5) | 513 (35.0) | <.001 |
| Light PA, mean (SD), min/d | 196.0 (32.2) | 262.2 (14.2) | 309.6 (14.0) | 379.6 (38.8) | <.001 |
| Reynolds Risk Score, mean (SD) | 16.2 (13.2) | 12.7 (10.3) | 11.5 (9.5) | 9.6 (8.2) | <.001 |
| MVPA, mean (SD), min/d | 34.2 (25.8) | 47.2 (29.8) | 56.5 (33.7) | 66.2 (35.7) | <.001 |
| Blood pressure, mean (SD), mm Hg | |||||
| Systolic | 127.6 (15.2) | 126.0 (13.9) | 124.8 (13.8) | 124.1 (13.7) | <.001 |
| Diastolic | 73.5 (9.4) | 73.0 (8.5) | 72.5 (8.4) | 71.6 (8.4) | <.001 |
| hsCRP, mean (SD), mg/Lc | 0.8 (1.1) | 0.7 (1.0) | 0.6 (1.0) | 0.4 (1.0) | <.001 |
| Cholesterol, mean (SD), mg/dL | |||||
| Total | 195.4 (40.0) | 198.1 (39.6) | 199.9 (39.4) | 202.5 (38.1) | <.001 |
| HDL | 56.6 (13.8) | 59.8 (14.1) | 62.1 (15.3) | 64.1 (15.2) | <.001 |
Abbreviations: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); HDL, high-density lipoprotein; hsCRP, high-sensitivity C-reactive protein; MVPA, moderate to vigorous PA; PA, physical activity; Q, quartile.
SI conversion factors: To convert cholesterol level to millimoles per liter, multiply by 0.0259; to convert hsCRP level to nanomoles per liter, multiply by 9.524.
Adjusted for awake wear time using the residuals method. Quartile cut points are 36 to 236 min/d for Q1, 237 to 285 min/d for Q2, 286 to 333 min/d for Q3, and 334 to 617 min/d for Q4. For some variables in the table, totals are less than the column headings because of missing data.
Cancer, chronic obstructive pulmonary disease, cognitive impairment, depression, diabetes, and osteoarthritis.
Natural log transformed.