TABLE 2

Community diversity by group as measured by Shannon, Chao, dominance, and evenness metricsa

GroupShannon indexChao indexDominance indexEvenness index
Iatrogenic stenosis2.46 ± 1.1172.2 ± 98.60.23 ± 0.270.32 ± 0.13
Idiopathic stenosis2.6 ± 0.6551.08 ± 15.290.18 ± 0.120.35 ± 0.16
Internal control2.7 ± 0.85123.76 ± 159.350.18 ± 0.130.24 ± 0.07
External control2.50 ± 0.3597.15 ± 81.410.17 ± 0.060.27 ± 0.10
  • a Mean value ± standard deviation was obtained for each index relative to group. No statistical differences were noted by group, where internal controls represented disease-free regions from patients with stenosis and external controls represented disease-free regions from patients without stenosis.