Table 2.

Percentage reductions in the total bacterial load in each study group.

	NaOCl (Group a)	Laser (Group b)	NaOCl + Laser Irradiation (Group c)
Mean	80.61	63.06	89.40
Standard Deviation	12.32	21.98	10.43
Median	80.54	58.18	92.69
Minimum	61.38	27.46	61.35
Maximum	99.35	99.87	99.67
Interquartile Range	18.58	29.51	12.08
n	19	19	19

The numbers for the percentage reduction follow a common rule of three of the basic data set: [100 − (100/base value) × final value].