Table 1.

Selected subjects (n, number of patients) according to country, periodontal status group and age.

	Periodontal Status	Age	Spain (n)	Colombia (n)
Selected subjects by country			90	77
Selected subjects by periodontal status group and country	Health and Gingivitis		30	18
	Periodontitis I-II		30	23
	Periodontitis III-IV		30	36
Selected subjects by periodontal status group, age and country	Health and Gingivitis	30–40	10	7
		41–50	10	5
		51–60	10	6
	Periodontitis I-II	30–40	10	11
		41–50	10	6
		51–60	10	6
	Periodontitis III-IV	30–40	10	11
		41–50	10	16
		51–60	10	9