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. 2019 Nov 21;52(12):e8474. doi: 10.1590/1414-431X20198474

Table 6. Mean frequency results (Hz).

Before therapy mean (SD) After therapy mean (SD) 1-month follow-up mean (SD) 3-months follow-up mean (SD) *P value
Open eyes
HILT 0.39 (0.18) 0.36 (0.22) 0.36 (0.23) 0.37 (0.23) 0.8618
HILT (p) 0.35 (0.21) 0.35 (0.24) 0.36 (0.23) 0.36 (0.25) 0.9022
LLLT 0.36 (0.21) 0.35 (0.25) 0.36 (0.25) 0.37 (0.25) 0.9112
LLLT (p) 0.36 (0.18) 0.34 (0.20) 0.37 (0.22) 0.36 (0.23) 0.9170
**P value 0.7700 0.7890 0.7820 0.7330
Closed eyes
HILT 0.48 (0.20) 0.45 (0.25) 0.48 (0.31) 0.50 (0.31) 0.7180
HILT (p) 0.51 (0.24) 0.47 (0.30) 0.47 (0.30) 0.49 (0.31) 0.7060
LLLT 0.51 (0.25) 0.48 (0.30) 0.49 (0.29) 0.50 (0.30) 0.7205
LLLT (p) 0.50 (0.21) 0.48 (0.31) 0.50 (0.30) 0.51 (0.32) 0.7200
**P value 0.6890 0.6678 0.6780 0.7005

*Friedman ANOVA, level of significance (before vs after vs 1-month follow-up vs 3-months follow-up). **Kruskal-Wallis ANOVA, level of significance (HILT vs HILT (p) vs LLLT vs LLLT (p) group). SD: standard deviation; HILT: high-intensity laser therapy group; HILT (p): high-intensity laser therapy sham group; LLLT: low-level laser therapy group; LLLT (p): low-level laser therapy sham group.