Factors influencing the occurrence of technical difficulties –
results of logistic regression analysis
Univariate regression analysis showed that the factors increasing the
probability of technical difficulties were: all types of fibrous tissue
binding sites: more than 2.5-fold increase, (OR=2.649;
p<0.001), fibrous tissue binding the lead to the SVC: 2-fold
increase (OR=2.080; p<0.01), to the RA: nearly 2.5-fold
increase (OR= 2.465; p< 0.001), to the TV: 2.5-fold increase
(OR=2.533; p<0.001), to the RV: 3-fold increase of risk (OR=
3.080; p<0.001), lead-to-lead binding sites: more than 2-fold
increase (OR=2.263; p< 0.001), presence of AMEL: increase of
33.8% (OR=1.338; p=0.055) and presence of excess lead loops: increase
of 76.1% (OR=1.761; p<0.01).
Multivariate analysis showed that fibrous tissue binding the lead to the
RA (OR=1.738; p<0.05), to the RV (OR=2.167;
p<0.001), lead-to-lead binding sites (OR=1.628;
p<0.01) and excess lead loops (OR=1.488; p<0.05)
were the strongest predictors of technical difficulties. Fibrous tissue
binding the lead to the TV approached the borderline of significance
(OR= 1.597; p=0.061) (Table 3).