Table 1: Linear Regression analysis of serum ion concentration as a predictor of tear ion concentration.

Table 5: Linear Regression analysis of serum ion concentration as a predictor of tear ion concentration.

	Mean	R²	Adjusted R²	F	T - Value	p- value
Na⁺ tear	131.06	0.002	-0.019	0.107	-0.327	0.745
Na⁺ serum	135.56
K⁺ tear	21.404	0.024	0.004	1.193	1.092	0.280
K⁺ serum	4.136
Cl^- tear	122.86	0.011	-0.009	0.555	0.745	0.460
Cl^- serum	101.58

The adjusted R² values suggested that sodium ion concentration in tears is more likely related to its concentration in serum more than the other pairs tested.