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Table 4 Correlations between Bacterial Burden and Selected Clinical Periodontal Constructs (n = 706)

From: Evaluating clinical periodontal measures as surrogates for bacterial exposure: The Oral Infections and Vascular Disease Epidemiology Study (INVEST)

  Attachment Loss Extent Constructs Pocket Depth Extent Constructs
Severity Threshold #AL ≥ Threshold %AL ≥ Threshold Sum AL ≥ Threshold Mean AL ≥ Threshold #PD ≥ Threshold %PD ≥ Threshold Sum PD ≥ Threshold Mean PD ≥ Threshold
2 mm 0.39 (A,C) 0.48 (A) 0.47 (A) 0.30 (A) 0.16 (A,E,F) 0.42 (A) 0.40 (A,C) 0.49 (A)
3 mm 0.48 (B) 0.48 (A) 0.46 (A) 0.21 (B) 0.51 (B) 0.61 (B) 0.48 (B) 0.25 (B,D)
4 mm 0.40 (A) 0.30 (B) 0.38 (B) 0.27 (A) 0.39 (C) 0.39 (A) 0.39 (A) 0.34 (C)
5 mm 0.39 (A) 0.29 (B) 0.34 (C) 0.23 (B) 0.39 (C) 0.38 (A) 0.35 (C) 0.28 (D)
6 mm 0.33 (C) 0.26 (B) 0.29 (D) 0.25 (B) 0.28 (D) 0.26 (C) 0.24 (D) 0.27 (D)
7 mm 0.29 (D) 0.23 (C) 0.25 (E) 0.26 (A,B) 0.18 (E) 0.20 (D) 0.19 (E) 0.18 (E)
8 mm 0.28 (D) 0.24 (B,C) 0.23 (F) 0.24 (A,B) 0.14 (F) 0.16 (D) 0.15 (F) 0.15 (E)
  1. Bacterial burden is the dependent variable for all 56 correlations presented. All 56 correlation coefficients are statistically significantly different than zero (p-value < 0.0001 for null hypothesis Ho: ρ = 0). Pairwise comparisons were performed between all seven correlation coefficients within each extent periodontal construct (represented in columns), to see if severity threshold impacted strength of correlation (Ho: ρ1i = ρ2i,); coefficients that do not share a common letter are statistically significantly different (p < 0.05) - based on methods for comparing correlated correlation coefficients from Meng et al.(Meng et al. 1992) For example, the correlation between bacterial burden (the common dependent variable) and %PD ≥ 3 mm (r = 0.61) is statistically significantly different than the correlation between bacterial burden and %PD ≥ 4 mm (r = 0.39).