Table 2.

Categorical Confirmatory Factor Analysis at Screening (n = 907)

Symptoms	Factor 1		Factor 2		R Squared
	Estimate	Standard Error	Estimate	Standard Error
Eyes that itch	0.72	0.019			0.52
Eyes that burn	0.78	0.015			0.61
Eyelids feel heavy or puffy	0.69	0.020			0.47
Feel like something is in your eye	0.76	0.016			0.58
Dry eyes	0.65	0.021			0.42
Gritty eyes	0.80	0.014			0.64
Irritated eyes	0.83	0.012			0.69
Eyes that tear or water	0.57	0.024			0.32
Red eyes or eyelids	0.61	0.023			0.38
Crusty eyes			0.83	0.016	0.69
Flaking from your eyelids			0.79	0.018	0.62
Eyelids that are stuck together			0.73	0.026	0.53
Debris like pieces of skin or dandruff in your eyes			0.82	0.019	0.67

Note: χ² (64 dfs) = 551. Comparative fit index = 0.954; Root mean square error of approximation = 0.092 with 90% confidence interval of 0.085 to 0.099). Estimated correlation between two factors was 0.72