. 2023 Apr 26;6(4):e239612. doi: 10.1001/jamanetworkopen.2023.9612

Table 1. Refractive and Biometric Outcomes at 12-Month Follow-up (Intention-to-Treat Analysis).

Outcome	Students, % (No./total No.)		Risk difference, (95% CI)^b	Relative risk (95% CI)^c	Relative efficacy^d	P value^e
Outcome	Intervention^a	Control	Risk difference, (95% CI)^b	Relative risk (95% CI)^c	Relative efficacy^d	P value^e
Incidence of myopia, %	40.8 (49/120)	61.3 (68/111)	20.4 (7.9 to 33.1)	0.67 (0.51 to 0.86)	33.4	.003
Mean (SD), change
SER, D	−0.35 (0.54)	−0.76 (0.60)	−0.41 (−0.56 to –0.26)	NA	53.9	<.001
AL, mm	0.30 (0.27)	0.47 (0.25)	0.17 (0.11 to 0.23)	NA	36.2	<.001

Abbreviations: AL, axial length; D, diopters; NA, not applicable; SER, spherical equivalent refraction.

^{^a}

The intervention group included those who continued the intervention and those with interrupted intervention.

^{^b}

Risk difference, absolute efficacy = value in control group − value in intervention group.

^{^c}

Relative risk = value in intervention group/value in control group.

^{^d}

Relative efficacy = (value in control group − value in intervention group)/value in control group.

^{^e}

The t test was used for change of AL and SER, and the χ² test was used for incidence.