Number of booster doses Diabetics (n=45) Non-diabetics (n=45) X2P
No. % No. %    
One 36 80.0 41 91.1 4.436 0.109
Two 5 11.1 4 8.9
Three 4 8.9 0 0.0
Table 6: Number of HBV vaccine booster doses needed for protection of diabetic and non-diabetic students.