. 2018 Feb 27;22(9):3079–3089. doi: 10.1007/s00784-018-2398-x

Table 7.

Backward stepwise multiple regression analyses

a) log-transformed serum elastase 60 months after nonsurgical therapy; n = 42; R² = 0.309; R² adjusted = 0.255; standard error of estimate = 0.184
	b	s.e. (b)	p
Constant	0.669	0.252	0.012
Aggressive periodontitis	0.360	0.117	0.004
African origin	0.288	0.127	0.029
Age	0.010	0.005	0.044
Analysis of variance: p = 0.003
b) log-transformed serum CRP 60 months after nonsurgical therapy; n = 42; R² = 0.190; R² adjusted = 0.170; standard error of estimate = 0.512
Constant	− 0.899	0.102	< 0.001
Aggressive periodontitis	0.493	0.161	0.004
Analysis of variance: p = 0.004
c) Lipopolisaccharide-binding protein 60 months after nonsurgical therapy; n = 42; R² = 0.438; R² adjusted = 0.360; standard error of estimate = 7.744
Constant	− 0.872	11.136	0.431
Aggressive periodontitis	11.420	4.963	0.027
Asian origin	− 8.982	4.189	0.039
Age	0.545	0.184	0.005
Body mass index 60 months after therapy	0.553	0.237	0.025
At least 1 supportive periodontal treatment visit per year	− 8.072	2.716	0.005
Analysis of variance: p = 0.001
d) Reduction of PISA from 12 weeks to 60 months; n = 42; R² = 0.374; R² adjusted = 0.324; standard error of estimate = 138.473
Constant	− 165.198	35.307	< 0.001
African origin	− 187.202	83.849	0.032
Female sex	− 103.235	47.514	0.036
Additional surgical treatment after T1	− 9.566	4.314	0.033
Analysis of variance: p < 0.001