Table 1. Characteristics of participants by MVPA level.a.
| Variables | Total | boys (days/week) (N, %) | girls (days/week) (N, %) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 0(2,236; 33.1%) | ≥1 to ≤3(2,842; 42.0%) | >3(1,687; 24.9%) | ES; p | 0(3,224; 49.0%) | ≥1 to ≤3(2,425; 36.8%) | >3(935; 14.2%) | ES;p | ||
| Age, mean (SD) | 15.18 (1.90) | 15.78 (1.82) | 15.06 (1.86) | 14.58 (1.75) | 0.06;<0.001 | 15.91 (1.76) | 14.54 (1.83) | 14.20 (1.59) | 0.15;<0.001 |
| Junior gradeb, N (%) | 6,836 (50.1) | 697 (31.2) | 1,549 (54.5) | 1,231 (73.0) | 0.32;<0.001 | 824 (25.6) | 1,611 (66.4) | 789 (84.4) | 0.47;<0.001 |
| BMI, mean (SD) | 19.61 (3.35) | 20.24 (3.69) | 20.00 (3.63) | 19.95 (3.66) | 0.01;0.028 | 19.48 (2.83) | 18.87 (3.00) | 18.52 (2.77) | 0.02;<0.001 |
| SESc, mean (SD) | 6.13 (1.64) | 5.85 (1.67) | 6.17 (1.63) | 6.44 (1.68) | 0.02;<0.001 | 5.92 (1.56) | 6.21 (1.58) | 6.56 (1.65) | 0.02;<0.001 |
| Exposure levels of television (hours/school day), N (%) | |||||||||
| 0 | 7,869 (58.6) | 1,349 (60.4) | 1,394 (49.2) | 836 (49.6) | 0.09;<0.001 | 2,182 (67.8) | 1,454 (60.0) | 594 (63.6) | 0.06;<0.001 |
| 3,903 (29.1) | 617 (27.6) | 1,029 (36.3) | 553 (32.8) | 742 (23.1) | 710 (29.3) | 230 (24.6) | |||
| >1 to ≤2 | 935 (7.0) | 142 (6.4) | 265 (9.3) | 136 (8.1) | 161 (5.0) | 166 (6.9) | 61 (6.5) | ||
| >2 | 710 (5.3) | 124 (5.6) | 148 (5.2) | 161 (9.5) | 133 (4.1) | 92 (3.8) | 49 (5.2) | ||
| Exposure levels of video or computer games or using a computer for non-educational purpose (hours/school day), N (%) | |||||||||
| 0 | 9,290 (70.2) | 1,491 (67.6) | 1,834 (65.7) | 1,060 (64.8) | 2,418 (75.7) | 1,705 (71.4) | 714 (77.9) | ||
| ≤1 | 2,440 (18.4) | 407 (18.5) | 589 (21.1) | 324 (19.8) | 0.04;0.011 | 513 (16.1) | 473 (19.8) | 120 (13.1) | 0.05;<0.001 |
| >1 to ≤2 | 761 (5.8) | 142 (6.4) | 191 (6.8) | 104 (6.4) | 135 (4.2) | 137 (5.7) | 47 (5.1) | ||
| >2 | 736 (5.4) | 164 (7.4) | 178 (6.4) | 149 (9.1) | 130 (4.1) | 74 (3.1) | 35 (3.8) | ||
Notes.
Abbreviations
- MVPA
- moderate to vigorous physical activity
- BMI
- body mass index
- SES
- subjective economic status
- ES
- effect size
a
Percentages do not always equal 100 because of rounding. Values may not always sum to sample size because of missing data
b
Junior grade indicates 7th–9th grade.
c
SES was considered as continuous variables (ranging from 1-the worst, to 10-the best).