. 2015 Dec 4;14:92. doi: 10.1186/s12940-015-0079-7

Table 5.

MMP-2 and MMP-9 concentrations in three groups based on the regulatory limit of water arsenic

Parameters	≤10 μg/L	10.1–50 μg/L	>50 μg/L	p-value (F-test)
Serum MMP-2 (ng/mL)^a	197.75 (1.48)	220.08 (1.37)	228.38 (1.40)^**	<0.01
Serum MMP-2 (ng/mL)^a	(n = 144)	(n = 44)	(n = 181)	<0.01
Serum MMP-9 (ng/mL)^a	43.60 (1.59)	53.57 (1.75)	55.20 (1.75)^***	<0.001
Serum MMP-9 (ng/mL)^a	(n = 145)	(n = 44)	(n = 184)	<0.001

n = number of study subjects. ^aGeometric Mean (GSD). ^**Significantly different from ≤ 10 μg/L group at p < 0.01. ^***Significantly different from ≤ 10 μg/L group at p < 0.001. p-values were from one way ANOVA test