Table 3.

Axial growth between the orthokeratology lens group and single‐vision spectacle groups.

Pairwise comparison	Contrast, mm	Std. Error	95% CI	Axial progression	OKL, mm	SVS, mm
(SVS#M06) versus (OKL#M06)	0.12	0.03	0.06 to 0.18	M6	–	–
(SVS#M12) versus (OKL#M12)	0.19	0.05	0.10 to 0.27	M12	0.09	0.28
(SVS#M18) versus (OKL#M18)	0.24	0.06	0.12 to 0.36	M18	0.17	0.41

CI = confidence interval; M12 = 12‐month follow‐up; M18 = 18‐month follow‐up; M6 = 6‐month follow‐up; OKL#M = interaction of OKL and month; OKL = orthokeratology group; Prog. = progression; Std. Error = standard error; SVS#M = interaction of SVS and month; SVS = single‐vision spectacle group.

Left: Postestimation test for the mixed model with pairwise comparison of groups and interaction between group and follow‐up visits at 6, 12 and 18 months and accounting for the exposure variables baseline axial length, age at time of inclusion, and cycloplegic spherical equivalent refractive error at time of inclusion, and with the allowance of a random slope. Right: actual axial progression calculated based on the output of the mixed model.