Periodontal inflamed surface area in patients on haemodialysis and peritoneal dialysis: a Croatian cross-sectional study

Table 3 Robust regression on PISA; variables were simultaneously input; only patients with complete data were included

	b	Β	t	p	FDR < 5%	r	sr
Dialysis
HD (referent group)
PD	−526.8	−0.53	−2.50	0.017	✓	−0.31	− 0.50
Confounders that were controlled
Age (years)	−2.0	−0.05	−0.47	0.644		−0.00	−0.02
Duration of dialysis (months)	−0.3	−0.03	− 0.18	0.856		0.08	−0.12
Number of teeth	43.3	0.77	5.95	< 0.001	✓	0.52	0.74
The last visit to the dentist	−13.4	−0.11	−0.99	0.327		−0.06	0.03
Smoking
Non-smoker (referent group)
Ex-smoker	47.3	0.10	0.33	0.744		−0.12	−0.11
Current smoker	163.7		0.86	0.393
Diabetes mellitus	− 418.0	−0.43	−1.73	0.092		−0.09	−0.26
Duration of diabetes mellitus	27.2	0.41	1.91	0.064		−0.08	0.32
HbA1c^a	−44.1	−0.10	−0.69	0.495		−0.14	−0.04
C-reactive protein (mg/L)	−9.5	−0.28	−2.12	0.041		−0.15	−0.42
Kt/V	− 494.5	−0.36	−2.20	0.034	✓	−0.21	−0.28
Thrombocytes (10⁹/L)	−2.2	−0.35	−1.80	0.081		−0.11	−0.04
Leukocytes (10⁹/L)	22.5	0.12	0.78	0.442		−0.06	− 0.06
Urea (mmol/L)	−4.9	−0.06	− 0.43	0.671		0.03	−0.15
Phosphorus (mmol/L)	138.4	0.11	0.94	0.354		0.07	0.22
HDL cholesterol (mmol/L)	−61.7	−0.08	−0.38	0.707		−0.07	0.01
Antihypertensive therapy
Beta-blockers	−209.4	−0.22	−1.64	0.110		0.22	−0.19
Angiotensin-converting Enzyme inhibitors	− 216.5	−0.20	− 1.66	0.106		0.07	0.03
Central α-2 receptor agents	11.0	0.02	0.07	0.943		0.16	0.10
Angiotensin II AT1-receptor blockers	− 159.1	−0.11	− 1.16	0.256		0.01	0.03
α₁-adrenoceptor antagonists	− 188.5	−0.18	−1.47	0.151		0.10	−0.31

Abbreviation: b Unstandardized multivariable robust regression coefficient, β Standardized multivariable robust regression coefficient, t Student’s t-test statistic with n-p-1 degrees of freedom where p is total number of parameters in the model, p two-tailed test, statistical significance of multivariable regression coefficient, FDR False discovery rate of < 5% calculated using the Benjamini-Hochberg method, r zero-order Pearson product-moment correlation with PISA, sr semipartial correlation with PISA after controlling for all other variables, HbA1c Glycated haemoglobin, Kt/V Dialysis adequacy measured as the ratio between dialyser clearance (K) (mL/min) multiplied by time in minutes (t) and volume of water a patient’s body contains, HDL High-density lipoprotein cholesterol
^aHbA1c = For participants not diagnosed with diabetes, the HbA1c value was arbitrarily set to 5.0

ISSN: 1472-6831