Table 3.

Overall results.

Symptom	Test 1 Mean (SD)	Test 2 Mean (SD)	Test 3 Mean (SD)	Test 4 Mean (SD)
1. General discomfort	1.34 (0.52)	1.64 (0.60)	2.90 (0.91)	3.38 (1.18)
2. Fatigue	1.16 (0.42)	1.20 (0.45)	1.72 (0.83)	1.86 (1.05)
3. Headache	1.02 (0.14)	1.10 (0.36)	1.32 (0.84)	1.46 (0.86)
4. Eye strain	1.42 (0.57)	1.54 (0.68)	2.10 (0.93)	2.46 (1.13)
5. Difficulty focusing	1.40 (0.53)	1.58 (0.64)	1.82 (0.98)	2.08 (0.93)
6. Salivation increasing	1.08 (0.27)	1.08 (0.34)	1.40 (0.76)	1.48 (0.93)
7. Sweating	1.14 (0.49)	1.18 (0.44)	1.64 (0.96)	1.92 (1.31)
8. Nausea	1.06 (0.31)	1.08 (0.34)	1.52 (0.84)	1.94 (1.11)
9. Difficulty concentrating	1.14 (0.40)	1.32 (0.55)	1.62 (0.85)	1.82 (0.92)
10. Fullness of the head	1.12 (0.38)	1.18 (0.48)	1.52 (0.76)	1.82(1.04)
11. Blurred vision	1.34 (0.74)	1.38 (0.75)	1.52 (0.86)	1.76 (1.08)
12. Dizziness with eyes open	1.08 (0.34)	1.26 (0.56)	2.56 (0.95)	2.94 (1.25)
13. Dizziness with eyes closed	1.06 (0.31)	1.38 (0.70)	2.92 (0.90)	3.38 (1.07)
14. Vertigo	1.08 (0.34)	1.24 (0.51)	2.08 (1.00)	2.64 (1.21)
15. Stomach awareness	1.06 (0.31)	1.12 (0.38)	1.62 (0.83)	2.18 (1.08)
16. Burping	1 (0)	1.04 (0.28)	1.08 (0.44)	1.14 (0.49)
The cumulative result	1.13 (0.12)	1.31 (0.25)	1.90 (0.60)	2.25 (0.78)