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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 4 Paired t test results of differences between visual contact target materials concerning average of SSL changes in Fig. 6

From: Reducing eye fatigue through the use of wood

Subjective symptoms items White plastic panel − black plastic panel White plastic panel − wood panel Black plastic panel − wood panel
Mean differences (s. d.) P values Mean differences (s. d.) P values Mean differences (s. d.) P values
1. dry eyes −0.27 (0.69) *
0.043
0.77 (0.73) **
0.000
1.03 (0.72) **
0.000
2. eye pain −0.57 (0.73) **
0.000
0.43 (0.63) **
0.001
1.00 (0.83) **
0.000
3. dizziness −0.10 (0.80) n. s.
0.501
0.27 (0.64) *
0.030
0.37 (0.85) *
0.025
4. eye fatigue −0.37 (1.25) n. s.
0.118
0.87 (0.82) **
0.000
1.23 (1.22) **
0.000
5. bleary eyes −0.60 (0.93) **
0.001
0.70 (0.79) **
0.000
1.30 (0.99) **
0.000
6. blurriness −0.60 (1.07) **
0.005
0.23 (0.43) **
0.006
0.83 (1.14) **
0.000
7. heaviness in head −0.23 (0.94) n. s.
0.182
0.20 (0.48) *
0.031
0.43 (0.90) *
0.013
8. sick feeling −0.30 (0.54) **
0.005
0.17 (0.46) n. s.
0.057
0.47 (0.68) **
0.001
9. headache −0.20 (0.55) n. s.
0.056
0.13 (0.43) n. s.
0.103
0.33 (0.66) *
0.010
10. grogginess −0.40 (0.97) *
0.031
0.13 (0.51) n. s.
0.161
0.53 (0.97) **
0.005
  1. SSL subjective symptoms level, s. d. standard deviation, n. s. not significant
  2. * p < 0.05, ** p < 0.01