Table II.

Comparison of the prevalence of erythrocyte alloimmunisation between patients with thalassaemia major and thalassaemia intermedia.

Subgroup	Model	N. of studies	Mean proportion	95% C.I.
TM	Random effects	25	0.1012	0.0773	0.1313
TI	Random effects	8	0.1497	0.0918	0.2345
All	Random effects	33	0.1100	0.0871	0.1380

Studies distinguishing the clinical variants, thalassaemia major (TM) and thalassaemia intermedia (TI).The mean proportion (prevalence) of alloantibodies is reported for patients with TM and TI with 95% confidence intervals (C.I.). The same indexes are reported on the aggregate (all) set of studies.