Group 
Mean ± SD 
Group I (control) 
6.42 ± 1.27 
Subgroup IIa 
18.74 ± 5.56 ⃰ #^ 
Subgroup IIb 
15.59 ± 3.72 ⃰ #^ 
Subgroup IIIa 
9.79 ± 2.61 ○● 
Subgroup IIIb 
8.30 ± 2.46 ○● 
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 
