Table 3.

Effects of L. paracasei KW3110 on CFF values.

CFF (Hz)	KW3110 Group (n = 28)			Placebo Group (n = 31)
	Week 0	Week 4	Week 8	Week 0	Week 4	Week 8
Before VDT load	39.13 ± 2.47	39.57 ± 2.95	39.98 ± 2.94	39.03 ± 2.62	39.45 ± 2.36	39.77 ± 2.83
After VDT load	37.68 ± 2.40	39.87 ± 2.52 **	39.56 ± 2.92 **	38.10 ± 2.97	39.24 ± 2.15 *	39.95 ± 2.13 *
Variation a	−1.45 ± 2.38	0.30 ± 2.70 *	−0.42 ± 2.31	−0.94 ± 2.04	−0.22 ± 2.03	0.17 ± 2.97

Data are expressed as the mean ± SD. The within-group comparisons between week 0 and week 4 or week 8 were carried out using a paired Student’s t-test with a Holm correction for multiple comparisons (** p < 0.01, * p < 0.05). ^a Variation indicated the difference of the values before and after the VDT load at each point. CFF = critical flicker frequency. VDT = visual display terminal. KW3110 = L. paracasei KW3110-treated group, placebo = control group.