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