Table 3. Average G-Index, Interproximal Inter G-Index, Gingival Bleeding Index (GBI), Visual Plaque Index (VPI), Interproximal VPI, and Calculus Index (CI).

	PORTO ALEGRE				TUCUMÁN SANTIAGO								TOTAL				p-value*	p-value**	p-value***	p-value****
	(n = 550)				(n = 550)				(n = 550)				(n = 1650)
Variable	Healthy		GI		Healthy		GI		Healthy		GI		Healthy		GI
	n=15		n=535		n=53		n=497		n=5		n=545		n=73		n=1577
	mean	SD	mean	SD	mean	SD	mean	SD	mean	SD	mean	SD	mean	SD	mean	SD
G-Index	0.44	0.05	1.12	0.34	0.36	0.11	1.11	0.35	0.24	23.4	1.73	0.28	0.37	0.12	1.33	0.44	0.000	0.424	0.000	0.000
Inter G-Index	0.49	0.08	1.17	0.32	0.36	0.11	1.09	0.35	0.30	0.28	1.76	0.28	0.38	0.13	1.35	0.43	0.000	0.002	0.000	0.000
GBI	3.1	3.0	22.9	18.4	0.02	2.3	23.0	19.7	2.2	2.2	74.1	23.4	2.3	2.5	40.6	31.9	0.000	0.408	0.000	0.000
VPI	35.8	18.8	70.5	18.1	29.4	12.1	73.5	20.0	44.2	21.9	81.6	18.1	31.7	14.8	75.2	19.4	0.001	0.001	0.000	0.000
Inter VPI	45.1	22.5	79.0	17.1	30.0	12.5	74.0	20.3	52.4	27.1	88.9	16.0	34.6	17.7	81.2	18.8	0.004	0.002	0.000	0.000
CI	52.0	34.9	88.5	21.1	25.9	26.9	73.8	32.0	41.2	28.5	81.1	27.2	32.0	30.2	81.3	27.7	0.003	0.000	0.000	0.003

G-Index, Gingival Index; Inter G-Index, Interproximal Gingival Index; GBI, Gingival Bleeding Index; VPI, Visual Plaque Index, Inter VPI, Interproximal Visual Plaque Index; CI, Calculus Index. Mann-Whitney test or Kruskall-Wallis adjusted p-value for significance, as a appropriate, to assess; differences between healthy versus gingival inflammation for all cities (*), prevalence of gingival inflammation Porto Alegre versus Tucumán (**), prevalence of gingival inflammation Porto Alegre versus Santiago (***) and prevalence of gingival inflammation Tucumán versus Santiago (****)