组别

优

良

差

优良率

A组(n = 85)

24

53

8

77 (90.59%)

B组(n = 116)

49

65

2

114 (98.28%)

χ²值

4.161

0.430

4.614

4.614

P值

P = 0.041

P = 0.512

P = 0.032

P = 0.032