Group 
Mean ± SD 
Group I (control) 
25.3 ± 8.2 
Subgroup IIa 
5.7 ± 1.9 ⃰ #^ 
Subgroup IIb 
7.3 ± 2.3 ⃰ # ^ 
Subgroup IIIa 
18.9 ± 5.3○● 
Subgroup IIIb 
20.7 ± 4.7○● 
⃰ Significantly different from the value of the control group at P˂0.05
#Significantly different from the value of subgroup IIIa at P˂0.05
^Significantly different from the value of subgroup IIIb at P˂0.05
○Significantly different from the value of subgroup IIa at P˂0.05
●Significantly different from the value of subgroup IIb at P˂0.05 
