Topographic and surgical risk factors for high postoperative residual astigmatism after small incision lenticule extraction in patients with different degrees of myopia: a retrospective cohort study

Table 3 Risk factors for high postoperative residual astigmatism in the high-myopia population

Covariate	Coefficient	95% CI		P
Covariate	Coefficient	Lower limit	Upper limit	P
Age	0.000	-0.006	0.007	0.971
Sex	0.014	-0.022	0.085	0.579
Cycloplegic refraction
SE	-0.201	-2.176	1.573	0.195
Sphere	-0.095	-0.217	0.028	0.113
Cylinder	0.632	0.260	3.027	0.024*
Axis	-0.058	-0.142	0.030	0.263
IOP	0.002	-0.014	0.016	0.878
BCVA	-0.812	-1.887	0.262	0.131
Manifest refraction
SE	0.012	-0.050	1.103	0.247
Sphere	0.087	-0.038	0.222	0.178
Cylinder	0.055	-0.027	0.142	0.126
Axis	0.013	-0.056	0.089	0.747
Steep corneal curvature	1.032	0.500	2.311	0.003*
Flat corneal curvature	-0.001	-0.029	0.028	0.985
Topographic cylinder	0.104	0.016	1.013	0.034*
Topographic axis	-0.022	-0.122	0.078	0.733
CCT
Apex	0.003	-0.022	0.045	0.619
Thinnest	-0.001	-0.004	0.002	0.427
Difference	-0.001	-0.011	0.008	0.790
ISV	0.106	-0.021	0.168	0.071
IHD	0.089	-0.030	0.159	0.080
Angle Kappa	0.092	-0.018	0.255	0.056
Lenticule thickness	0.004	-0.003	0.010	0.977
Optic zone	-0.162	-0.328	-0.080	0.045*
Incision length	0.024	0.006	0.133	0.044*

BCVA: best-corrected visual acuity, CCT: central corneal thickness, CI: confidence interval, IHD: index of height decentration, IOP: intraocular pressure, ISV: index of surface variance, N: number, SE: spherical equivalent
* denotes a significant effect of the covariate

ISSN: 1471-2415