Table 2.

Mean median range and standard deviation of measured microbial parameters in villages of Poldasht city.

Month	Coliform		Fecal coliform
	Mean ± SD	Median (range)	Mean ± SD	Median (range)
September	18.6 ± 54.9	0 (0 to 240)	16.6 ± 55.2	0 (0 to 240)
October	17 ± 65	0 (0 to 460)	6.9 ± 24.8	0 (0 to 93)
November	18.7 ± 56.8	0 (0 to 240)	0.2 ± 0.7	0 (0 to 3)
December	2.7 ± 8	0 (0 to 43)	0 ± 0	0 (0 to 0)
January	6.3 ± 20.8	0 (0 to 93)	0 ± 0	0 (0 to 0)
February	2.2 ± 5	0 (0 to 23)	0.8 ± 2.7	0 (0 to 9)
March	3.6 ± 8	0 (0 to 43)	0 ± 0	0 (0 to 0)
April	6.9 ± 19	0 (0 to 93)	1.2 ± 1.9	0 (0 to 4)
May	21.7 ± 71.3	0 (0 to 460)	20 ± 93.7	0 (0 to 460)
June	21.8 ± 79.8	0 (0 to 460)	0.5 ± 1.6	0 (0 to 7)
July	44.2 ± 85.2	0 (0 to 240)	6.4 ± 15.5	0 (0 to 43)
August	15.8 ± 49.5	0 (0 to 240)	1.1 ± 2	0 (0 to 4)
P-value†	0.005		–

^†Based on Linear Mixed model.