Choice reaction index | Experimental group (n = 1020) | χ2 | Control group (n = 1112) | χ2 | χ2 | |||
a1) | b2) | a3) | b4) | 1) 3) | 2) 4) | |||
Qualified | 876 | 929 | 13.509* | 956 | 983 | 2.934 | 0.003 | 4.126* |
Unqualified | 144 | 91 | 156 | 129 |