Table 4.

Backward multiple regression analysis

Aponeurosis				Skeletal muscle
TNF	B	P	% change R2	TNFRSF1A	B	P	% change R2
Intercept	38.67	0.007		Intercept	192.46	0.000
MMP9	0.21	0.002	38	MMP9	−0.93	0.001	31
MMP1	0.19	0.018	17	MMP7	7.06	0.011	14
MMP3	2.27	0.026	15	MMP2	0.51	0.015	12
MMP13	−4.82	0.074	8	MMP3	−46.98	0.046	8
Group	2.79 × G	0.810	0	Group	−12.30 × G	0.089	5
Adjusted R2= 0.78; P= 0.003				Adjusted R2= 0.78; P= 0.003
TNFRSF1A
Intercept	54.42	0.007
MMP14	0.57	0.010	19
MMP1	−0.12	0.080	7
MMP3	−1.07	0.078	7
Group	15.94 × G	0.040	10
Adjusted R2= 0.43; P= 0.046
TNFRSF1B
Intercept	34.07	0.000
MMP13	3.44	0.028	26
MMP9	0.12	0.031	24
Group	−8.13 × G	0.421	3
Adjusted R2= 0.43; P= 0.046

Stepwise backward multiple regression was performed with an F-ratio probability of 0.10 as the criterion for removal or inclusion in the model. G = 0, incisional hernia (IH) group; G = 1, non-IH group.

Dependent variables: TNF, TNFRSF1A, TNFRSF1B (aponeurosis) and TNFRSF1A (skeletal muscle).

G, group; B, estimate of the change in the dependent variable attributable to a change of one unit in the independent variable; P, significance; R², R-squared.