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Official Journal of the Japan Wood Research Society

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