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Table 2 Baseline characteristics of the subject in the probiotic and placebo groups N = 68

From: Effects of probiotic bacterium Weissella cibaria CMU on periodontal health and microbiota: a randomised, double-blind, placebo-controlled trial

Characteristics Probiotic
(n = 34)
N (%)
Placebo
(n = 34)
N (%)
x2 or Z or t P-value
Age (year) (mean ± SD) 23.4 ± 2.9 23.6 ± 3.4 − 0.230a .817
Gender Male 24 (70.6) 19 (55.9) 1.580 .209
Female 10 (29.4) 15 (44.1)
Drinking   24 (70.6) 23 (67.6) 0.066 .793
Smoking 3 (8.8) 6 (17.6) 1.150a .476
Brushing/day None 1 (2.9) 0 (0.0) 3.190a .530
Once 1 (2.9) 3 (8.8)
Two times 13 (38.2) 10 (29.4)
Three times 10 (29.4) 14 (41.2)
Four or more 9 (26.5) 7 (20.6)
  1. aFisher’s exact test