Coils alone provided 77 % protection ( 95 % CI : 50 % -89 % ) , LLINs provided 91 % protection ( 95 % CI : 72 % -97 % ) and the combination of coils and LLINs provided 94 % protection ( 95 % CI : 77 % -99 % ) against P. falciparum compared with the control arm .