Table 1: Sample distribution and mean standard deviation of E. faecalis count at different levels

Serial no		The mean (SD) of E. faecalis count (CFU/mL) before instrumentation (S1)		The mean (SD) of E. faecalis count (CFU/mL) after instrumentation (S2)		The mean (SD) of E. faecalis count (CFU/mL) after 7 days intracanal medication (S3)
Group I n = 9		1.85 (± 0.59)×105		7.73 (± 2.67)×103		5.03 (± 1.30)×101
Group II n = 10		1.84 (± 0.63)×105		6.59 (± 1.71)×103		3.15 (± 0.59)×101
Group III n = 9		2.03 (± 0.48)×105		8.78 (± 1.10)×103		3.52 (± 0.54)×101
Group IV n = 9		2.00 (± 0.58)×105		7.89 (± 1.91)×103		2.65 (± 0.73)×101

SD: Standard deviation