The association between plain water intake and periodontitis in the population aged over 45: a cross-sectional study based on NHANES 2009–2014

Table 2 Relationship between plain water intake and periodontitis

	Model I	Model II	Model III
	OR¹ (95%CI²)	OR (95%CI)	OR (95%CI)
Plain water intake (quartiles)
Q1	Reference	Reference	Reference
Q2	0.79 (0.67, 0.91)	0.75 (0.64, 0.88)	0.84 (0.68, 1.05)
Q3	0.72 (0.62, 0.84)	0.75 (0.64, 0.88)	0.75 (0.63, 0.96)
Q4	0.63 (0.54, 0.73)	0.69 (0.59, 0.81)	0.78 (0.62, 0.96)
P for trend	< 0.0001	< 0.0001	0.031
Plain water intake, (every 500 ml)	0.93 (0.91, 0.96)	0.96 (0.93, 0.99)	0.97 (0.94, 1.01)

¹OR: odds ratio
² 95%CI: 95% confidence interval
Model I: Non-adjusted model
Model II: adjusted for gender, age, race
Model III: adjusted for: age, gender, race, education level, family to ratio of family income to poverty, BMI, smoking status, alcoholic status, hypertension, diabetes, CKD, cardiovascular disease, physical activity time, total energy intake

ISSN: 1472-6831