Groups N Mean (SD) P-value Tukey's post hoc
pairwise comparison
of tear strength
Group Significancea
Control 10 9.15 (0.52) 0.00;
df = 3 		PTFE 0.00
Ti 0.00
Zn 0.01
PTFE 10 10.8 (0.8) Ti 0.00
Zn 0.00
Ti 10 12.01 (0.61) Zn 0.00
Zn 10 8.13 (0.84) -

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