Table 2.

Degree of general potentially pathogenic contamination

CFU per 25 cm2	Group A	Group B	p-value*
n	45	45
Mean	82.49	55.29	0.06
Before washing
SD	65.21	64.30
Minimum	0.00	0.00
Maximum	200.00	200.00
CI 95%	19.59	19.32
After washing
Mean	3.09	1.47	0.02
SD	5.04	4.77
Minimum	0.00	0.00
Maximum	29.00	30.00
CI 95%	1.52	1.43

*Student’s t-test.