TABLE 3

Time-dependent changes in the activity and number of NK cells in blooda

Parameter and groupb8 wk before the exam2 wk before the exam1 day before the examImmediately after the exam2 wk after the exam
NK cell activity (%)
    Placebo19.8 ± 1.523.9 ± 1.919.3 ± 1.313.8 ± 1.3c17.6 ± 1.4
    L. casei strain Shirota20.9 ± 2.126.0 ± 2.418.5 ± 1.915.7 ± 1.517.7 ± 1.7
NK cell no. (cells/ml)
    Placebo17.1 ± 1.113.0 ± 1.2c14.2 ± 1.110.2 ± 0.9d11.9 ± 1.0d
    L. casei strain Shirota17.7 ± 1.316.8 ± 1.416.3 ± 1.511.2 ± 0.9d13.1 ± 1.0
  • a Values indicate means ± SE. Data were analyzed by Dunnett's multiple-comparison test within a group and the unpaired Student's t test between the groups.

  • b Placebo group, n = 24; L. casei strain Shirota group, n = 23.

  • c P < 0.05.

  • d P < 0.01 vs. baseline (8 weeks before).