. 2014 Mar 11;9(3):e91528. doi: 10.1371/journal.pone.0091528

Table 3. LSD Post Hoc multiple comparisons of water quality variables among the three types of watersheds.

Water quality	Urban watersheds-Natural watersheds		Urban watersheds-Agricultural watersheds		Agricultural watersheds-Natural watersheds
	Mean difference	Sig.	Mean difference	Sig.	Mean difference	Sig.
NH₄ ⁺-N	1.757^*	0.000	1.958^*	0.000	−0.201	0.450
SRP	0.291	0.001	0.329^*	0.000	−0.037	0.510
COD_Mn	3.204^*	0.021	2.842^*	0.021	0.362	0.699
NO₃ ^–N	1.566	0.136	0.450	0.617	1.116	0.144
Cl⁻	11.245^*	0.001	9.593^*	0.001	1.652	0.410
Na⁺	5.082^*	0.016	2.879	0.104	2.203	0.129
Mg²⁺	0.719	0.668	3.777^*	0.019	−3.058^*	0.021
K⁺	4.827^*	0.000	4.532^*	0.000	0.295	0.678

*indicates significant at p<0.05.