Groups N Mean (SD) P-value Tukey's post hoc
pairwise comparison
of tear strength
Group Significancea
Control 10 11.56 (0.88) 0.00;
df = 3 		PTFE 0.04
Ti 0.00
Zn 0.78
PTFE 10 12.54 (0.83) Ti 0.74
Zn 0.00
Ti 10 12.90 (0.54) Zn 0.00
Zn 10 11.22 (0.91) -

aSignificant at the level P < 0.05 (Tuckey's post hoc test).
N = number; SD = standard deviation; PTFE = polytetrafuoroethylene.