Table 7 Meta-regression analysis of prevalence and MDR pattern of bacterial pneumonia by different categories of studies included in the systematic review and meta-analysis

Prevalence

Total isolates

1.212

0.031

7.60

< 0.001*

1.141801–1.287055

Publication year

0.858

0.418

-0.31

0.762

0.2715376 − 2.711604

Sample size

0.928

0.0089

-8.58

< 0.001*

0.9088477 0.9471566

MDR

Total isolates

2.283

1.020

1.85

0.114

0.7652871 − 6.812579

Publication year

26.789

43.822

2.01

0.091

0.4893512 − 1466.579

Sample size

0.701

0.119

-2.10

0.081

0.4636661 − 1.061176