Table 8.

Pairwise comparison of Group I (zinc oxide noneugenol luting cement) and Group III (zinc phosphate luting cement) using Mann–Whitney U-test

Ranks
Cement	n	Mean rank	Sum of ranks
Group I	10	14.55	145.50
Group III	10	6.45	64.50
Total	20
Test statisticsb		Difference_score
Mann–Whitney U		9.500
Wilcoxon W		64.500
Z		−3.144
Asymptotic significant (two-tailed)		0.002
Exact significant (two×[one-tailed significant])		0.001a

^aNot corrected for ties,

^bGrouping variable: Group