The heterogeneity test was only calculated when the meta-analysis had two or more studies and then was computed the I test. The heterogeneity was considered as important when I was larger that 50%.
El test de heterogeneidad solo fue calculado cuando el metaanálisis poseía dos o más estudios, siendo calculado el test de I. La heterogeneidad fue considerada importante cuando I mayor que 50%.
O teste de heterogeneidade só foi calculado quando a metanálise possuía dois ou mais estudos, sendo calculado o teste de I. A heterogeneidade foi considerada importante quando I maior que 50%.