The Effects of Chewing Gum in Preventing Eyestrain

Table 2

Data of between chewing gum and tablet candy in all subjects.

Outcomes		Number of data	Gum (Δ)	Tablet candy (Δ)	value
			Median (IQR)
VAS (mm)	Eye tiredness	46	1.5 (-6.5, 19.8)	11.5 (-7.8, 28.5)	0.657	0.065
	Eye heaviness		3.5 (-9.3, 19.5)	4.5 (-4.3, 25.3)	0.694	0.058
	Blurred vision		0 (-2.3, 15.0)	0 (-5.8, 19.3)	0.909	0.017
	Double vision		0 (-1.0, 7.3)	1.0 (-1.3, 14.5)	0.397	0.125
	Eye dryness		0 (-9.8, 16.3)	1.0 (-12.0, 19.3)	0.757	0.046
	Subjective accommodation (D)	92	-0.04 (-0.32, 0.42)	-0.14 (-0.50, 0.22)	0.043	0.211
	Spherical equivalent refraction (D)		0 (-0.25, -0.13)	0 (-0.25, 0.13)	0.267	0.116
	Ring break-up time (sec)		0 (-2.35, 0.15)	0 (-1.15, 0)	0.680	0.043

IQR: interquartile range (25th, 75th percentiles); VAS: visual analog scale. ; Wilcoxon signed-rank test. r: effect size.