Table 9.

Meta regression model between incidence of Gram-negative bacilli and the different study-level and patient-level variables in a univariate analysis using the 63 cohorts

Covariates	Level	β-coefficient	SE (β)	Z	P-valuea
Latitude	Degrees	−0.0330	0.0108	−3.07	0.002
Age	Years	−0.0466	0.0585	−0.79	0.4261
Female sex	PCT	0.0173	0.0126	1.36	0.1711
CABG	PCT	0.0067	0.0087	0.76	0.4423
Publication year	Year	−0.0092	0.0138	−0.66	0.5055

Note:

^aTest for subgroup differences using the random-effect model between groups with Q statistics, df =1, and P-value.

Abbreviations: SE, standard error; CABG, coronary artery bypass grafting; PCT, percentage; df, degree of freedom.