Prevalence of Keratoconus in a Population-Based Study in Syria

Table 2

Bivariate summary statistics of the outcome (patient outcome) and continuous explanatory variables.

Variable	Mean ± SD
	Normal (N = 788)	Suspect (N = 39)	Keratoconus (N = 12)
K1 (D)	42.7 ± 1.5	43.2 ± 1.2	45.1 ± 2.1
K2 (D)	43.8 ± 1.7	44.3 ± 1.3	48.6 ± 2.9
K Avg (D)	43.2 ± 1.4	43.7 ± 1.2	46.8 ± 2.4
ThKMin (um)	545.3 ± 32.8	510.5 ± 35.7	468.9 ± 34.3
CCT (um)	548.3 ± 33.6	515.0 ± 36.2	478.5 ± 34.5

K1 = flat keratometry; K2 = steep keratometry; Avg K = simulated average keratometry; ThkMin = minimum corneal thickness; CCT = central corneal thickness; D = diopter; SD = standard deviation; N = number.