Table 2.
Mean (SD) PF and PA slope values and change score values for early (cycles 1–5) and later (cycles 5–9) portions of the study.
| Variable | Mean (SD) | Variance (SE) | Comparison of early and late changes |
|---|---|---|---|
| Early PF slopea | 0.30 (0.64) | 0.63 (0.04) | Early (vs) late: |
| Late PF slopea | 0.37 (0.65) | 0.90 (0.07) | Chi-squared test (1) = 1.53, P = 0.22 |
| Early PA slopea | −4.55 (17.67) | 491.62 (29.98) | Early (vs) late: |
| Late PA slopea | −4.99 (14.53) | 366.33 (23.37) | Chi-squared test (1) = 0.14, P = 0.71 |
| Early PF changeb | 0.65 (3.44) | 14.70 (0.65) | Early (vs) late: |
| Late PF changeb | 1.73 (2.73) | 16.52 (1.08) | Chi-squared test (1) = 22.4, P < 0.001 |
| Early PA changeb | −14.29 (98.19) | 11175.24 (473.61) | Early (vs) late: |
| Late PA changeb | −21.32 (71.07) | 7701.41 (391.53) | Chi-squared test (1) = 1.91, P = 0.17 |
aValues reflect estimated annual change, in minutes per week for PA and seconds for PF.
bValues reflect overall cumulative change during time period of 5 years.