Table 3.

Comparison of four groups (1A, 1B, 2A, 2B) with respect to gingival index and plaque index scores by Kruskal–Wallis analysis of variance test and Pairwise comparison by Mann–Whitney Utest

Groups	GI scores		PI scores
	Mean±SD	Sum of ranks	Mean±SD	Sum of ranks
Group 1A	1.63±1.27	121.00	1.59±1.23	122.00
Group 1B	1.40±0.50	34.00	1.56±0.69	40.00
Group 2A	1.37±0.47	121.50	1.35±0.42	122.50
Group 2B	1.89±0.53	851.50	1.83±0.49	843.50
H	11.6201		10.6321
P	0.0088*		0.0139*
Pair-wise comparison by Mann–Whitney U-test
1A versus 1B	0.7940		0.6015
1A versus 2A	0.7527		0.9164
1A versus 2B	0.0134*		0.0134*
1B versus 2A	1.0000		0.7940
1B versus 2B	0.2278		0.3764
1A versus 2B	0.0067*		0.0103*

*P<0.05. SD: Standard deviation; GI: Gingival index; PI: Plaque index