TABLE 1

Multivariate analysis between outdoor/indoor characteristics and microbial richness and compositional variation and fungal quantitya

TABLE 1
  • a The microbial richness and fungal quantity were calculated by a forward stepwise linear multiple regression, and the microbial community was calculated by a forward stepwise Adonis multivariate analysis with 10,000 permutations. Only environmental characteristics with P < 0.1 were kept in the final multivariate model. Associations with P values of <0.05 are indicated by boldfacing and asterisks (***, P < 0.001; **, P < 0.01; *, P < 0.05), and associations with 0.05 < P < 0.1 are presented in regular typeface. Observed OTU values (α diversity) and fungal DNA 1 and 2 values (α diversity) are expressed as beta (95% CI); community variation values (β diversity) are expressed as R2. The sums of R2 values of the final multivariate model are also presented in the last row. Fungal DNA 1 was estimated by qPCR of the ITS1 region which captured at least 530 fungal species; fungal DNA 2 was estimated by qPCR of the 28S rRNA region which captured at least 140 fungal species. A detailed list of the fungal species captured was provided in previous publications (36, 80). A/C, air conditioning.

  • b Number of years since redecoration: 0, >5 years; 1, <5 years.

  • c Floor level: 1, ground; 2, top; 3, 2 to 4 floors; 4, 5 to 22 floors.

  • d Quality of the interior: 1, high; 2, normal; 3, old.

  • e Floor type: 1, stone; 2, wood; 3, plastic; 4, wall-to-wall carpet.