Tear Lipid Layer Thickness in Children after Short-Term Overnight Orthokeratology Contact Lens Wear

Table 2

Correlation of LLT (average) and other clinical variables of 163 eyes at baseline.

		LLT average (nm)	Age (years)	Sex	Sph (D)	Cylin (D)	Axis	BCDVA (logMAR)	Axial length (mm)	K1 (D)	K2 (D)	TCT (um)
Number of cases (n)		163	163	163	155	155	106	116	157	153	154	149
Average		58.09	10.67	—	−2.86	−0.35	79.15	1.06	24.77	42.70	43.82	544.89
Standard deviation		21.66	1.89	—	1.18	0.47	83.89	0.10	0.83	1.27	1.41	28.07
Association with LLT average (nm)	r	—	0.17	−0.08	−0.00	−0.05	0.04	0.03	0.18	0.20	−0.19	−0.21
	P	—	0.03	0.33	0.97	0.53	0.66	0.76	0.02	0.02	0.02	0.01
	n	—	163	163	155	155	106	116	157	153	154	149

LLT average: average value of LLT during 19.1-second measurement. Sph: spherical power. Cylin: cylindrical power. BCDVA: best corrected distance visual acuity. K1: flat corneal curvature. K2: steep corneal curvature. TCT: thinnest corneal thickness. Blink: number of blinks during 19.1 s. Partial blink: number of partial blinks during 19.1 s. r: relative coefficient. P: significance. n: number.