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Table 1 Summary of effect sizes of significant predictors on biomineral ureolytic activity

From: A multiple regression assessment of the biomineral urease activity from urine drainpipes of California public restrooms

Significant predictor variables

\( \hat{\upbeta} \)

CI (95%)

Effect on biomineral activity per g VS as elasticitya

Annual users per rest area

0.5

0.17, 0.82

A 25% increase in annual users per rest area corresponds to a 11.7% (3.9, 20.1) increase in biomineral activity

VS/TS (g g−1)

0.59

0.21, 0.97

A 25% increase in VS/TS (g g−1) corresponds to a 14.1% (4.8, 24.2) increase in biomineral activity

Intrasystem location: main drain

1.24

0.83, 1.64

Compared to samples obtained from cartridges, those obtained from the gallery main drain had a 245% (129, 416) larger geometric mean in biomineral activity

  1. aParenthetical contents represent effect sizes at limits of confidence intervals