Fig. 2
From: The indirect health effects of malaria estimated from health advantages of the sickle cell trait
The odds ratios for HbAS in cases versus community controls, stratified by year of study. Triangles show the ORs for HbAS among patients admitted with a negative and diamonds for patients admitted with a positive blood slides for P. falciparum malaria parasites. Circles show the prevalence of P. falciparum parasite positivity among all admitted patients. The x-axis denotes each year of the study between 2000 and 2005. Horizontal dashed line denotes an OR of one: ORs below the line denote a protective effect of HbAS against the condition of interest. Error bars show 95% confidence intervals
