Table 1.
Sample characteristics overall and by sex, and annual surveillance summary, 2020–2024.
| Panel A. Record-level characteristics overall and by sex | |||
|---|---|---|---|
| Characteristic | Overall | Male | Female |
| Records, n | 106,461 | 44,240 | 62,221 |
| Age, years | 20.67 ± 1.54 | 20.79 ± 1.55 | 20.59 ± 1.53 |
| BMI, kg/m2 | 21.64 ± 3.52 | 22.39 ± 3.86 | 21.11 ± 3.17 |
| Total physical-fitness score | 71.60 ± 8.56 | 68.80 ± 8.72 | 73.59 ± 7.86 |
| Panel B. Surveillance records and class-year units by survey year | ||||
|---|---|---|---|---|
| Survey year | Records, n | Class-year units, n | Mean class-year size | Mean total score |
| 2020 | 17,302 | 452 | 38.3 | 70.72 |
| 2021 | 18,195 | 490 | 37.1 | 73.37 |
| 2022 | 23,003 | 536 | 42.9 | 69.86 |
| 2023 | 23,484 | 542 | 43.3 | 71.00 |
| 2024 | 24,477 | 571 | 42.9 | 73.11 |
Continuous variables are presented as mean ± SD unless otherwise indicated. The analytic sample comprised 106,461 records nested within 2,591 class-year units. The overall mean class-year size was 41.09 ± 12.63 records (median 41, range 5–84), the mean proportion of male students was 0.406 ± 0.257, and the mean class BMI was 21.63 ± 0.81 kg/m2.