Table 3: Intergroup comparison for mean change in GI, PI and EIBI scores from baseline to 4 and 8 weeks among the study groups by one-way ANOVA

Intergroup comparisons
Duration		Orthomanual		Powered		Sonic		p-value
Mean difference scores with SD
Gingival index
T0-T1		0.05 (0.10)		0.03 (0.10)		0.05 (0.10)		0.77 NS
T0-T2		0.05 (0.10)		0.04 (0.10)		0.05 (0.10)		0.94 NS
T1-T2		0.00 (0.04)		0.01 (0.04)		0.00 (0.04)		0.66 NS
Plaque index
T0-T1		0.11 (0.24)		0.07 (0.18)		0.08 (0.18)		0.81 NS
T0-T2		0.10 (0.23)		0.08 (0.18)		0.08 (0.18)		0.86 NS
T1-T2		–0.01 (0.07)		0.01 (0.06)		0.00 (0.06)		0.85 NS
Eastman’s interdental bleeding index
T0-T1		0.08 (0.18)		0.10 (0.18)		0.09 (0.18)		0.94 NS
T0-T2		0.10 (0.19)		0.09 (0.19)		0.10 (0.19)		0.98 NS
T1-T2		0.02 (0.09)		–0.01 (0.09)		0.01 (0.09)		0.92 NS

NS: p > 0.05, i.e. statistically not significant