Code per group Valid N Sum of Ranks Tear 1 (Mean ΔPaq=+11.40μm) 101 27 728.5000 Tear 2 (Mean ΔPaq=+12 μm) 103 14 350.5000 Tear 3(Mean ΔPaq=+15 μm) 102 12 352.0000

Table 4: Kruskal-Wallis ANOVA by Ranks; Dependent variable: ΔPaq Independent (grouping) variable: Tipo de lag. Kruskal-Wallis test: H (2, N=53)=0.5010691 p=0.7784.