Height/Weight | Experimental group (n = 1020) | χ2 | Control group (n = 1112) | χ2 | χ2 | |||
a1) | b2) | a3) | b4) | 1) 3) | 2) 4) | |||
Qualified | 834 | 874 | 5.756* | 906 | 896 | 0.292 | 0.030 | 9.858* |
Unqualified | 186 | 146 | 206 | 216 |