Table 4 Estimated mean differences in postoperative IOP in nanophthalmos based on GEE models for all variables

From: Morphological features of anterior segment: factors influencing intraocular pressure after cataract surgery in nanophthalmos

Variable	Univariate GEE models		Multivariate GEE models
Variable	Beta ^a	P value	Beta ^a	P value
Age	−0.076 ± 0.040	0.056	− 0.069 ± 0.018	< 0.001^b
Gender	NA	0.391
Eye laterality	NA	0.868
CCT	0.021 ± 0.016	0.185
AL	−0.526 ± 0.866	0.544
ACD	0.256 ± 1.086	0.814
LT	2.168 ± 2.329	0.352
Preoperative IOP	0.824 ± 0.175	< 0.001^b	0.662 ± 0.102	< 0.001^b
Glaucoma surgery	NA	0.001^b
Extent of PAS	0.018 ± 0.004	< 0.001^b	0.012 ± 0.004	0.003^b
Boomerang-shaped iris	NA	0.790
Iris crypt grading	0.857 ± 1.938	0.658
SC diameter	−0.032 ± 0.041	0.437
SC area	−0.003 ± 0.001	0.004^b	−0.002 ± 0.001	0.001^b
TM thickness	−0.043 ± 0.030	0.149	0.040 ± 0.023	0.090
TM width	−0.012 ± 0.019	0.524
TM area	0.0003 ± 0.0001	0.032^b

IOP = intraocular pressure, GEE = generalized estimating equation, NA = not applicable, CCT = central corneal thickness, AL = axial length, ACD = anterior chamber depth, LT = lens thickness, PAS = peripheral anterior synechiae, SC = Schlemm’s canal, TM = trabecular meshwork
^a Data represent the mean changes ± standard error in postoperative IOP anticipated for each factor. GEE analysis was used
^b Statistically significant (P < 0.05)

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