Table 3 Microbial diversity in each study
From: Systematic review of gut microbiota and attention-deficit hyperactivity disorder (ADHD)
No. | Study | Alpha diversity index | Alpha diversity | Beta diversity index | Beta diversity |
|---|---|---|---|---|---|
1 | Aarts et al. [12] | Shannon, Chao1 | No significant differences | – | – |
2 | Jiang et al. [9] | ACE, Chao1, Shannon, Simpson | No significant differences | Unweighted and weighted UniFrac, Bray–Curtis PCoA | Could not be differentiated |
3 | Prehn-Kristensen et al. [14] | Shannon, Chao1 | Decreased (pShannon = 0.036) | ANOSIM, ADONIS, Betadisper from the R package vegan v2.4–1 | Differed significantly (pANOSIM = 0.033; pADONIS = 0.006; pbetadisper = 0.002) |
4 | Wang et al. [10] | Shannon, Chao1 | Shannon index (p = 0.0378) and Chao index (p = 0.0351) were increased significantly in ADHD Simpson index (p = 0.0339) was decreased significantly in ADHD | Unweighted & weighted UniFrac, PCoA | No significant differences |
5 | Wan et al. [11] | Shannon, Chao1, Simpson | No significant differences | – | – |
6 | Szopinska-Tokov et al. [13] | Shannon–Wiener, Faith’s phylogenetic diversity | No significant differences | UniFrac distance metric, ADONIS, Betadisper ver 2.5–2, PCoA | Differed significantly (10 genera showed nominal difference) |