Table 4.

Relationship between mean clinical attachment level, mean pocket depth at baseline and mean change in clinical attachment level with the incidence of NAFLD among participants of the Study of Health in Pomerania, 1997–2012

	Incidence Rate Ratio IRR (95% CI)
	Unadjusted	P Value	Adjusted a	P Value
Baseline periodontitis
Mean CAL	0.99 (0.85, 1.16)	0.9	1.11 (0.92, 1.34)	0.3
Mean PD	1.02 (0.58, 1.80)	0.9	1.28 (0.63, 2.57)	0.5
Progression of periodontitis
Participant with baseline CAL <3mm (n=1,091)
≥2mm (Yes v. No)	0.72 (0.32, 1.63)	0.5	0.44 (0.15, 1.30)	0.1
≥1mm (Yes v. No)	0.95 (0.63, 1.42)	0.6	0.88 (0.61, 1.28)	0.5
Participants with baseline CAL ≥3mm (n=372)
≥2mm (Yes v. No)	2.32 (1.00, 5.37)	0.05	2.07 (0.96, 4.58)	0.06
≥1mm (Yes v. No)	1.78 (1.02, 3.11)	0.04	1.55 (0.90, 2.65)	0.1

All estimates were averages from 40 rounds of multiple imputation combined using Rubin’s rule and the variance a function of the within and between completed dataset variances

Estimates are for each 3mm increase in mean CAL at baseline, or 4mm increase in mean PD at baseline

Progression of periodontitis is the mean difference in CAL between baseline and first follow-up visits

Adjustment variables: age, sex, waist circumference, BMI, physical activity, alcohol consumption, education, smoking and diabetes. Interaction P=0.05

^aConfounders and censoring-adjusted estimates