[Table 1].

Overview of the shared task datasets and comparison to UMLS Metathesaurus

	UMLS	TAC 2017 ADR track	FDA shared task	SMM4H 2019
Source of input data	-	SPL	SPL	Tweet
Number of records	-	200	100	684
Total number of AE descriptions	428,673	13,436	16,427	1,122
Total number of unique AE descriptions	241,096	4,475	5,156	746
Total number of unique MedDRA PTs	22,774	1,941	1,946	248
Average # of tokens in unique AE descriptions	4.07	3.79	3.64	3.39