G6PD and Plasmodium vivax malaria: For P. vivax malaria, the OR from six datasets obtained from four papers15, 30, 32, 36 showed that there was no association between G6PD and vivax malaria (OR, 0.87; 95% CI, 0.28–2.66; n, 6; P = 0.81), however, the two non-analyzable papers, Louicharoen 200934 and Khim 201333, reported significant association of G6PD with P. vivax.