This guide answers all of that
RCT evidence: A: Robust replicated results from at least 2 large long-term double-blind RCT, ideally with confirmation from a systematic review or meta-analysis B: Supporting evidence from the primary outcome of at least one large long-term double-blind RCT C: A lack of supporting evidence from the primary outcome of a large long-term double-blind RCT but promising results from either small pilot RCTs or from post-hoc and planned secondary analyses
Howard AD, Feighner SD, Cully DF, Arena JP, Liberator PA, Rosenblum CI, Hamelin M, Hreniuk DL, Palyha OC, Anderson J, Paress PS, Diaz C, Chou M, Liu KK, McKee KK, Pong SS, Chaung LY, Elbrecht A, Dashkevicz M, Heavens R, Rigby M, Sirinathsinghji DJ, Dean DC, Melillo DG, Van der Ploeg LH, et al
Cannot redeclare control with same name "grid_4_qv_shadow_hover_box_shadow_type"
doi:10.1111/jpi.12208