Table 3.

Meta-regression between incidence of mediastinitis and the different study-level and patient-level variables in a univariate analysis

Covariates	Level	β-coefficient	SE (β)	Z	P-value
Latitude	Degrees	−0.0020	0.0007	−2.67	0.0075
Age	Years	0.0068	0.0029	2.35	0.018
Female sex	Percent	0.0003	0.0008	0.4367	0.6623
CABG	Percent	0.0006	0.005	1.20	0.2029
Publication year	Year	0.0010	0.0006	1.63	0.1023

Abbreviations: SE, standard error; CABG, coronary artery bypass grafting.