Table 2

Ocular geometric parameters of the Gutenberg Prematurity Eye Study study sample (n=438) for each study group

Gestational age (GA)	Group 1	Group 2	Group 3	Group 4	Group 5	Group 6
	GA≥37	GA 33–36	GA 29–32	GA≤28	GA≤32	GA≤32
		No ROP	No ROP	No ROP	ROP without treatment	ROP with treatment
Participants/eyes (n)	140/280	134/267	88/175	20/36	43/80	13/23
Right eye
Mean corneal radius (mm)	7.89±0.30	7.77±0.28*	7.71±0.43*	7.73±0.20	7.63±0.32†	7.66±0.26*
White-to-white distance (mm)	12.23±0.35	12.2±0.4	12.1±0.4*	11.9±0.3†	11.8±0.5†	11.5±0.4†
Anterior chamber depth (mm)	2.93±0.32	3.01±0.32*	3.04±0.30*	2.88±0.31	3.00±0.44	2.36±0.69
Lens thickness (mm)	3.78±0.33	3.78±0.33	3.76±0.27	3.76±0.24	3.61±0.26*	4.46±0.45*
Axial length (mm)	23.7±1.2	23.6±1.1	23.3±1.1*	23.0±0.9*	23.3±1.3*	22.8±1.7*
Left eye
Mean corneal radius (mm)	7.88±0.32	7.77±0.27*	7.71±0.31*	7.72±0.21	7.64±0.30†	7.47±0.30*
White-to-white distance (mm)	12.2±0.6	12.2±0.4	12.1±0.5*	11.9±0.4†	11.8±0.5†	11.5±0.5†
Anterior chamber depth (mm)	2.94±0.33	3.03±0.32*	3.04±0.34*	2.97±0.27	3.00±0.36	2.36±0.46
Lens thickness (mm)	3.76±0.34	3.77±0.32	3.75±0.32	3.61±0.26	3.61±0.26*	4.27±0.48*
Axial length (mm)	23.7±1.2	23.6±1.1	23.4±1.1*	23.3±1.3*	23.4±1.2*	22.4±2.2*

Linear regression analysis was applied to compare the different groups with the full-term control group (reference).
*Statistical difference (p<0.05) compared with the control group.
†Statistical difference (p<0.001) compared with the control group.
n, number; ROP, retinopathy of prematurity.