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. 2014 Nov 5;9(11):e111026. doi: 10.1371/journal.pone.0111026

Table 2. Spearman correlation matrix of the percent resistances to the eight drugs in seven of the nine sampling sites.

AMP C LEV TE CN SXT SMM CTC
AMP 1.000
C 0.898** 1.000
LEV 0.503 0.524 1.000
TE 0.048 0.286 0.286 1.000
CN 0.587 0.452 −0.048 0.333 1.000
SXT 0.934** 0.905** 0.548 0.214 0.595 1.000
SMM 0.311 0.405 0.000 0.071 0.262 0.524 1.000
CTC 0.036 0.286 0.143 0.952** 0.357 0.119 −0.071 1.000

The sites of Haizi reservoir and Cuo River upstream have been removed based on the low antibiotic levels and few E. coli isolates, respectively. AMP = ampicillin, C = chloromycetin, LEV = levofloxacin, TE = tetracycline, CN = gentamycin, SXT = sulfamethoxazole-trimethoprim, SMM = sulfamonomethoxine, CTC = chlortetracycline). ** indicate the significance level of p<0.01.