Table 5.

Interactive association between smartphone and tablet usage (hours per day) on spherical equivalent refraction (SER, D).

	Smartphone Usage (h/day)	Tablet Usage (h/day)	Baseline	1-Year Follow-Up	Change
Right eye
	<2	<2	−1.29 (2.02)	−1.46 (1.98)	−0.17 (1.18)
	≥2	<2	−1.88 (2.19)	−2.12 (2.30)	−0.24 (0.96)
	<2	≥2	−1.54 (2.22)	−1.72 (2.16)	−0.18 (0.90)
	≥2	≥2	−1.73 (2.07)	−1.94 (2.14)	−0.20 (0.93)
p-value			<0.001	<0.001	0.68
Left eye
	<2	<2	−1.27 (2.02)	−1.47 (2.04)	−0.20 (1.20)
	≥2	<2	−1.84 (2.18)	−2.05 (2.27)	−0.21 (0.94)
	<2	≥2	−1.48 (2.08)	−1.74 (2.05)	−0.27 (0.89)
	≥2	≥2	−1.62 (2.04)	−1.79 (2.10)	−0.17 (0.92)
p-value			<0.001	<0.001	0.86