Table 3.

Myopia control rates in absolute numbers (≤ baseline) and follow-up dropout rates.

	PBM therapy group	Control group	Effect size of the treatment for axial length (%)
Group baseline sample size	24	19
Axial length control rate at 3 months	90.48%	0.00%	121.05
Axial length control rate at 6 months	77.27%	6.67%	130.43
Axial length control rate at 9 months	78.57%	16.67%	113.89
Axial length control rate at 12 months	60.00%	0.00%	103.33
Cycloplegic refraction control rate at 12 months	90.00%	0.00%	128.87
Dropout rate at 12 months	20.00%	40.00%

PBM Therapy Group, Photobiomodulation Therapy Group; Control Group, single-vision spectacles group. The effect sizes of the treatment between the two groups were calculated with the following formula: $\frac{\mathit{mean}\mathit{changes}\mathit{of}\mathit{PBM}\mathit{group}-\mathit{mean}\mathit{change}\mathit{of}\mathit{control}\mathit{group}}{\mathit{mean}\mathit{change}\mathit{of}\mathit{control}\mathit{group}}$.