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RESULTS
The two factor ANOVA
Showed a significant difference between yoga and control groups, i.e. Factor A. [F = 27.9, the F value for DF = 1, 120 at the .001 level (two tailed) = 12.8, hence P < .001]. Here the actual DF = 1, 120 were chosen as the nearest values in the probability table]. The difference between the 4 assessments, i.e. baseline, day 10, day 20 and day 30 was also significant, i.e. Factor B [F = 5.3, the F value for DF = 1, 120 at the .005 level (two-tailed) = 5.05. Hence P < . 005]. The
Table 1: Group mean values of CFF (± SEM) for yoga and control groups at baseline (0 days), and after 10, 20 and 30 days.
 Fig.1: Group mean critical flicker fission frequency (CFF) values ± SEM in yoga and control groups (18 subjects) for baseline (BL), days 10 (D 10), 20 (D 20) and 30 (D30). *P< .05, **P<.001) 1; D20 versus BL, D 30 versus BL respectively (Tukey test).
interaction between factors A and B (A' B) was not significant [F = 0.1, P> .51]. The group average CFF values ± SEM of the four groups at the 4 assessments are provided in Table 1, Fig.l.
The Tukey multiple comparison test
Showed significant differences between the CFF values of the yoga group at days 20 and 30, compared to the baseline reading (P< .05, P< .001, respectively). The day 10 - baseline comparison for both groups as well as other comparisons for the control group were not significant.
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