Table 2.

Associations between ischemic heart diseases and different independent variables including periodontitis by Cox regression analysis

Independent variables at baseline	All individuals (n = 858) HR, CI, p value	Women (n = 459) HR, CI, p value	Men (n = 399) HR, CI, p value	YO (n = 471) HR, CI, p value	OO (n = 387) HR, CI, p value
Age category	HR: 1.9, CI: 1.4–2.5, p = 0.000**	HR: 2.5, CI: 1.6–3.8, p = 0.000**	HR: 1.4, CI: 0.9–2.2, p = 0.098
BMI ≥ 30	HR: 1.2, CI: 0.9–1.7, p = 0.246	HR: 1.2, CI: 0.8–2.0, p = 0.417	HR: 1.3, CI: 0.8–2.2, p = 0.304	HR: 1.3, CI: 0.8–2.0, p = 0.284	HR: 1.2, CI: 0.7–2.1, p = 0.479
Diabetes type 2	HR: 1.5, CI: 1.0–2.4, p = 0.079	HR: 1.5, CI: 0.8–3.0, p = 0.243	HR: 1.4, CI: 0.7–2.6, p = 0.310	HR: 1.6, CI: 0.8–2.9, p = 0.153	HR: 1.4, CI: 0.7–3.0, p = 0.311
Gender	HR: 1.2, CI: 0.9–1.6, p = 0.349			HR: 1.4, CI: 1.0–2.2, p = 0.079	HR: 0.9, CI: 0.6–1.5, p = 0.768
Hypertension	HR: 1.5, CI: 1.1–2.0, p = 0.009**	HR: 1.8, CI: 1.2–2.8, p = 0.006**	HR: 1.2, CI: 0.7–1.8, p = 0.498	HR: 1.5, CI: 1.0–2.3, p = 0.049*	HR: 1.5, CI: 1.0–2.3, p = 0.079
History of AMI	HR: 2.3, CI: 1.5–3.5, p = 0.000**	HR: 2.5, CI: 1.1–5.8, p = 0.033*	HR: 2.4, CI: 1.4–4.1, p = 0.001**	HR: 2.5, CI: 1.2–5.0, p = 0.010*	HR: 2.2, CI: 1.2–4.0, p = 0.006**
Periodontitis	HR: 1.5, CI: 1.1–2.1, p = 0.017*	HR: 2.1, CI: 1.3–3.4, p = 0.002**	HR: 1.1, CI: 0.7–1.7, p = 0.749	HR: 1.3, CI: 0.8–2.2, p = 0.229	HR: 1.7, CI: 1.0–2.6, p = 0.033*
Smoking	HR: 1.1, CI: 0.8–1.5, p = 0.634	HR: 1.0, CI: 0.7–1.6, p = 0.900	HR: 1.2, CI: 0.8–1.8, p = 0.475	HR: 1.3, CI: 0.9–2.0, p = 0.181	HR: 0.9, CI: 0.5–1.4, p = 0.579

AMI acute myocardial infarction, BMI body mass index, Periodontitis = alveolar bone loss ≥ 5-mm distance from the CEJ to marginal bone level on ≥ 30% of sites, YO young-old 60–72 years, OO old-old 78–93 years, *p < 0.0.5, **p < 0.01