Table 4. Differences in Percentage of Time Spent in MVPA During School, PE, and Afterschool PA Program by Demographic Characteristics*. During school hours (450 mins/day) During PE (45 mins/day) During afterschool PA program (40 mins/day) Sex Boys 10.5 (0.7) 37.4 (1.5) 60.9 (1.8) Girls 8.0 (0.5) 25.8 (1.2) 51.6 (1.4) P-value †  .002 <.001 <.001 Grade 3rd 7.9 (0.8) 27.1 (2.2) 56.9 (2.1) 4th 10.2 (0.6) 32.8 (1.7) 57.5 (1.6) 5th 9.6 (0.7) 34.8 (2.2) 54.5 (2.1) P-value†  .061 (3rd vs 4th) # .020 (3rd vs 5th) # .455 Race/ethnicity Black 10.2 (0.5) 35.16 (1.52) 53.0 (1.4) Hispanic 7.9 (0.7) 29.48 (1.80) 56.2 (1.7) Others 9.6 (1.1) 30.09 (3.09) 59.7 (2.9) P-value †  .031 (Black vs Hispanic) # .045 (Black vs Hispanic) # .092 BMI‡ (n, %) <85th pct 9.1 (0.6) 31.7 (1.5) 57.2 (1.5) ≥85th pct 9.4 (0.6) 31.5 (1.9) 55.4 (1.8) P-value †  .697 .927 .398 PA = physical activity; PE = physical education; MVPA = moderate and vigorous intensity physical activity *values are the average % of time spent in MVPA estimated from the general linear mixed model adjusting for other variables † P-values were estimated from the omnibus F-test in the general linear mixed model ‡BMI for age and sex percentile #Tukey’s adjustment was used for pairwise comparisons.