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. 2014 Mar 20;8(9):1768–1780. doi: 10.1038/ismej.2014.32

Table 2. Correlation between alteration in microbiota structure (ΔPC1) and change in MGI (ΔMGI) for the 50-host cohort at NG-baseline, baseline-EG and NG-EG.

Spearman correlation (rho) NG to baseline
Baseline to EG
NG to EG
  NG.PC1 ΔPC1 NG.MGI ΔMGI B.PC1 ΔPC1 B.MGI ΔMGI EG.PC1 ΔPC1 EG.MGI ΔMGI
NG to baseline
 NG.PC1 NA
 ΔPC1 −0.86 NA
 NG.MGI 0.37 −0.42 NA
 ΔMGI −0.36 0.4 −0.98 NA
                         
Baseline to EG
 B.PC1         NA
 ΔPC1 0.28 −0.51       NA
 B.MGI             NA
 ΔMGI     0.39 −0.38   0.53   NA
                         
NG to EG
 EG.PC1 0.4 −0.44       0.89   0.48 NA
 ΔPC1 −0.56 0.43       0.49   0.43 0.43 NA
 EG.MGI     0.39 −0.37   0.53   1 0.48 0.43 NA
 ΔMGI           0.44   0.86 0.41 0.56 0.86 NA

Abbreviations: EG, experimental gingivitis; MGI, Mazza Gingival Index; NG, natural gingivitis; PC1, first principal component.

Only the rho values with its corresponding P<0.05 (that is, significant correlation) were shown. Significant within-phase ΔPC1-ΔMGI correlations were labeled in italic. Significant inter-phase ΔPC1-ΔPC1 or ΔMGI-ΔMGI correlations were labeled in bold.