Table 1.

Statistics of trials’ phases

Phase	No. of trials in our dataset	No. of trials in clinicaltrials.gov
Phase 2	128	47 398
Phase 3	116	32 707
Phase 1	108	34 121
Phase 4	88	27 726
Phase 1/Phase 2	0	11 582
Phase 2/Phase 3	0	5632
Early Phase 1	0	3500
Total	500	162 666