Table 1.
Comparison of demographic factors by groupa
| Demographic | Grade 1 | Grade 2 | Grade 3T | Grade 3S | P |
|---|---|---|---|---|---|
| Sex | |||||
| Male | 177 (67.8) | 164 (71.9) | 139 (69.8) | 49 (71) | 0.795 |
| Female | 84 (32.2) | 64 (28.1) | 60 (30.2) | 20 (29) | |
| Total, N | 261 (100.0) | 228 (100.0) | 199 (100.0) | 69 (100.0) | |
| Age, years | 15.97±0.53 | 16.83±0.49 | 17.62±0.51 | 17.61±0.52 | <0.001* |
| BMI, kg/m2 | 21.37±2.99 | 21.26±3.28 | 21.58±3.23 | 21.25±3.16 | 0.748 |
| <25 | 234 (87.9) | 200 (87.7) | 173 (86.9) | 62 (89.9) | 0.787 |
| ≥25 | 27 (10.3) | 28 (12.3) | 26 (13.1) | 7 (10.1) | |
| Smoking history | |||||
| Yes | 1 (0.4) | 5 (2.2) | 3 (1.5) | 0 (0) | 0.221 |
| No | 260 (99.6) | 223 (97.8) | 196 (98.5) | 69 (100.0) | |
Notes:
a
Data are presented as n (%) or mean ± standard deviation.
*
P<0.001.
Abbreviations: 3T, still had a test to take; 3S, success in college application; BMI, body mass index.