. Author manuscript; available in PMC: 2022 Jun 1.

Published in final edited form as: J Cataract Refract Surg. 2021 Jun 1;47(6):759–766. doi: 10.1097/j.jcrs.0000000000000498

Table 1.

Statistics of Optical Coherence Tomography Parameters

	Pachymetric Min (μm)	Pachymetric Min-Max (μm)	Pachymetric SN-IT (μm)	Epithelial Std Dev (μm)
Normal	531.6±24.9	−57.1±11.2	20.4±9.1	1.5±0.6
Manifest keratoconus	438.5±45.0^*	−126.4±49.5^*	71.8±27.8^*	6.0±2.3^†
Subclinical keratoconus	458.5±48.4^*	−110.3±15.3^*	68.8±15.3^*	4.8±1.5^†
FFK	490.3±34.1^*	−77.9±22.7^*	43.2±22.1^*	2.5±1.2^†
Step-1 cutoff values	< 515	< −71	> 28	> 1.7

2-tailed t-test p<0.0001

^†

2-tailed Mann-Whitney test p<0.001, compared to normal group.

Values reported as average ± standard deviation

Abbreviations: FFK = forme fruste keratoconus; Min = minimum; Min-Max = minimum – maximum; SN-IT= superonasal – inferotemporal; Std Dev = standard deviation.