Table 1. Descriptive statistics of study variables among US adolescents.
| Total (n = 12 081) |
Male (n = 6109) |
Female (n = 5972) |
P-valuea | ||||
| % | SE | % | SE | % | SE | ||
| Grade | 0.6 | ||||||
| 9th | 26.8 | 0.6 | 27.0 | 0.8 | 26.7 | 0.8 | |
| 10th | 25.5 | 0.6 | 26.0 | 0.9 | 25.0 | 0.8 | |
| 11th | 24.0 | 0.5 | 23.7 | 0.5 | 24.4 | 0.7 | |
| 12th | 23.6 | 0.6 | 23.3 | 0.8 | 24.0 | 0.7 | |
| Race/ethnicity | 0.7 | ||||||
| Non-Hispanic white | 56.4 | 3.5 | 56.8 | 3.5 | 56.1 | 3.7 | |
| Non-Hispanic Black | 13.2 | 1.8 | 12.8 | 1.8 | 13.6 | 1.9 | |
| Hispanic | 20.3 | 2.2 | 20.3 | 2.3 | 20.3 | 2.3 | |
| Others | 10.1 | 1.1 | 10.2 | 1.1 | 10.1 | 1.1 | |
| Breakfast consumption | <0.001 | ||||||
| All 7 days | 38.1 | 0.8 | 42.1 | 1.0 | 34.1 | 1.2 | |
| ≤6 days | 61.9 | 0.8 | 57.9 | 1.0 | 65.9 | 1.2 | |
| Fruit and vegetable consumption | <0.001 | ||||||
| All 7 days | 22.1 | 0.8 | 24.2 | 0.9 | 20.1 | 1.0 | |
| ≤6 days | 77.9 | 0.8 | 75.8 | 0.9 | 79.9 | 1.0 | |
| Soda consumption | <0.001 | ||||||
| 0 times/day | 22.0 | 1.0 | 19.4 | 0.9 | 24.4 | 1.2 | |
| ≥1 times/day | 78.0 | 1.0 | 80.6 | 0.9 | 75.6 | 1.2 | |
| MVPA | <0.001 | ||||||
| S-MVPA (≥60 minutes/day) | 47.6 | 1.0 | 57.6 | 0.9 | 37.8 | 1.4 | |
| I-MVPA (<60 minutes/day) | 52.3 | 1.0 | 42.3 | 0.9 | 62.1 | 1.4 | |
| Missing | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.0 | |
| STP | <0.001 | ||||||
| Active-STP (≥1 STP) | 54.0 | 1.2 | 59.8 | 1.3 | 48.4 | 1.4 | |
| No-STP (0 STP) | 45.1 | 1.1 | 39.6 | 1.3 | 50.6 | 1.3 | |
| Missing | 0.9 | 0.5 | 0.7 | 0.4 | 1.0 | 0.6 | |
| MSEx | <0.001 | ||||||
| S-MSEx (≥3 day) | 48.5 | 1.9 | 57.8 | 2.2 | 39.4 | 1.9 | |
| I-MSEx (<3 day) | 44.5 | 1.7 | 35.2 | 1.5 | 53.6 | 1.9 | |
| Missing | 7.0 | 3.0 | 7.0 | 3.1 | 7.0 | 3.0 | |
| TV hours | 0.6 | ||||||
| ≥3 hours/day | 31.8 | 1.0 | 32.0 | 1.1 | 31.7 | 1.3 | |
| <3 hours/day | 67.9 | 1.0 | 67.7 | 1.2 | 68.2 | 1.3 | |
| Missing | 0.3 | 0.1 | 0.3 | 0.1 | 0.2 | 0.1 | |
| Computer hours | 0.2 | ||||||
| ≥3 hours/day | 41.0 | 1.1 | 41.7 | 1.1 | 40.3 | 1.4 | |
| <3 hours/day | 58.7 | 1.1 | 57.9 | 1.1 | 59.5 | 1.4 | |
| Missing | 0.3 | 0.1 | 0.3 | 0.1 | 0.2 | 0.1 | |
| Obeseb | <0.001 | ||||||
| Yes (≥95th percentile) | 13.7 | 0.6 | 16.6 | 0.8 | 10.8 | 0.6 | |
| No (<95th percentile) | 86.3 | 0.6 | 83.4 | 0.8 | 89.2 | 0.6 | |
MVPA, moderate and vigorous physical activity; I-MSEx, insufficient-MSEx; I-MVPA, insufficient-MVPA; MSEx, muscle-strengthening exercise; S-MSEx, sufficient-MSEx; S-MVPA, sufficient-MVPA; STP, sports team participation; SE, standard error; TV, television.
aRao-Scott x2 test of independence between male and female.
bObesity was determined using the sex-specific BMI-for-age growth chart.
All estimates are weighted by a three-stage cluster sampling design of 2013 national YRBS.