Table 2.
Natural Environmental and Physical Activity Variables by Season During the MBC Studya
| Variables | Spring Mean (SD) | Summer Mean (SD) | Fall Mean (SD) | Winter Mean (SD) |
|---|---|---|---|---|
| Number of unique study days | 275 | 276 | 273 | 226 |
| Average temperature (°F) | 51.0 (13.2) | 75.0 (5.9) | 55.9 (13.8) | 27.1 (11.2) |
| Precipitation (inches) | 0.89 (0.21) | 0.16 (0.39) | 0.10 (0.32) | 0.09 (0.22) |
| Day length (hours) | 13.3 (1.1) | 14.6 (0.4) | 11.1 (1.1) | 9.8 (0.7) |
| Minimum temperature (°F) | 41.8 (11.9) | 65.6 (5.9) | 46.8 (12.8) | 20.4 (12.4) |
| Maximum temperature (°F) | 60.1 (15.4) | 83.0 (6.7) | 63.8 (15.0) | 33.6 (11.5) |
| Total number of observation days | 1,301 | 1,422 | 1,590 | 993 |
| Baseline sedentary (minutes/day)b | 550 (86) | 535 (86) | 541 (105) | 533 (95) |
| Baseline light (minutes/day)b | 282 (82) | 298 (82) | 294 (99) | 271 (94) |
| Baseline MVPA (minutes/day)b | 34 (26) | 34 (24) | 30 (24) | 33 (26) |
a
April 2005–April 2008.
b
Activity minutes/day adjusted for accelerometer wear time.
MVPA, moderate to vigorous physical activity; MBC, Make Better Choices