#	Query	Results
S25	S12 AND S24	510
S24	S13 OR S14 OR S15 OR S16 OR S17 OR S18 OR S19 OR S20 OR S21 OR S22 OR S23	1,112,233
S23	TX allocat* random*	6,013
S22	(MH "Quantitative Studies")	15,390
S21	(MH "Placebos")	10,010
S20	TX placebo*	43,326
S19	TX random* allocat*	6,013
S18	(MH "Random Assignment")	42,512
S17	TX randomi* control* trial*	118,648
S16	TX ( (singl* n1 blind*) or (singl* n1 mask*) ) or TX ( (doubl* n1 blind*) or (doubl* n1 mask*) ) or TX ( (tripl* n1 blind*) or (tripl* n1 mask*) ) or TX ( (trebl* n1 blind*) or (trebl* n1 mask*) )	876,075
S15	TX clinic* n1 trial*	198,873
S14	PT Clinical trial	79,974
S13	(MH "Clinical Trials+")	209,925
S12	S1 OR S2 OR S3 OR S4 OR S5 OR S6 OR S7 OR S8 OR S9 OR S10 OR S11	2,206
S11	TX morning after contracept*	19
S10	TX day after pill*	10
S9	TX morning after pill*	89
S8	TX post‐coit* intercept*	2
S7	TX postcoit* intercept*	3
S6	TX post‐coit* contracept*	26
S5	TX postcoit* contracept*	1,711
S4	TX emergency post‐coit*	7
S3	TX emergency postcoit*	27
S2	TX emergency contracept*	1,403
S1	(MM "Contraceptives, Postcoital+")	1,303