This field is only populated in the Clinical_raw file (not the Clinical_final where it is always missing). In the raw clinical file, values are a mixture of non-standardized values which may include numbers, words, NULL, N/A, free-form text, and other unknown values.
This field is only populated in the Clinical_raw file (not the Clinical_final where it is always missing). In the raw clinical file, values are a mixture of non-standardized values which may include numbers, words, NULL, N/A, free-form text, and other unknown values.
Source: Million Hearts Data Registry