Table 2.
Predictors for physical activity during school stay (accelerometer counts), non-significant p-values not shown.
| The GENMOD Procedure, Repeated for Season and Measure Day, Estimate (Standard Error, SE) | Dependent Variable: Total Daily Accelerometer Counts | ||||
|---|---|---|---|---|---|
| Variable | (I) | (J) | Estimate ** (Diff. I-J) | SE | p-Value |
| Season | March (ref.) | May | −44,857 | 20,823.0 | 0.0312 |
| Measured day * | Day1 (ref.) | Day 2 | 14,765 | 7146.4 | 0.0388 |
| Day 3 | 39,306 | 10,137.0 | 0.0001 | ||
| Day 4 | 46,678 | 8027.0 | <0.0001 | ||
| Day 5 | 39,723 | 8820.0 | <0.0001 | ||
| Day 2 (ref.) | Day 3 | 24,541 | 9730.6 | 0.0117 | |
| Day 4 | 31,914 | 8117.8 | <0.0001 | ||
| Day 5 | 24,958 | 8647.0 | 0.0039 | ||
| Grade | 2nd grade (ref.) | 5th grade | 67,497 | 10,839.0 | <0.0001 |
| 8th grade | 86,440 | 15,032.0 | <0.0001 | ||
| Gender | Girl (ref.) | Boy | −32,194 | 9254.0 | 0.0005 |
| Weather | Cloudless (ref.) | grey cloudiness | 28,328 | 8511.6 | 0.0009 |
| partly cloudy | 13,213 | 5760.0 | 0.0218 | ||
| Grey cloudiness (ref.) | partly cloudy | −15,115 | 7432.0 | 0.0420 | |
| white cloudiness | −21,460 | 8730.4 | 0.0140 | ||
| Time outdoors (min) | 1076.7 | 71.8 | <0.0001 | ||
* 1 = Monday, 2 = Tuesday, 3 = Wednesday, 4 = Thursday, 5 = Friday, and for two schools in May: 1 = Thursday, 2 = Friday, 3 = Monday, 4 = Tuesday, 5 = Wednesday; ** The estimate is the difference between the reference value (I) and the comparative value (J), but for the variable “time outdoors” the estimate means that by each time unit (minute) outdoors the total daily accelerometer counts increase.