Table 3.

Subgroup analysis and meta-regression models

Subgroup	Studies (n)	P value*	P value**
Cause of hospital admission
Burns	2	0.019	0.32
No burns	4	0.003
Cardiac surgery	1	NA	0.53
No cardiac surgery	5	0.194
Average age
IAH vs. Non-IAH
≥60 years	4	0.02	0.96
<60 years	2	0.005
Body mass index
≥24 kg/m2	3	0.01	0.21
<24 kg/m2	1	NA

IAH, intra-abdominal hypertension.

*P value represents test effect of subgroup analysis; **P value represents interaction assessed by meta-regression models.