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• Use: FIELD = VALUE to compare for equality. When comparing with true/false fields such as OUTCOMEDIED, OUTCOMETHREAT, OUTCOMEER, etc., compare with = "y" or != "y". When comparing with large fields (SYMPTOMS, WRITEUP, PRIOR, MEDS, CURILL, or PRECON) any occurrence of the string in the field is considered to be a match. When comparing to dates (VACCINATED, ONSET, etc.) can only compare with whole years.
• Use: FIELD != VALUE to compare for non-equality.
• Use: FIELD > VALUE to compare for greater-than (use >= for greater-than-or-equals).
• Use: FIELD < VALUE to compare for less-than (use <= for less-than-or-equals).
• Multiple expressions can be separated with AND or OR and can be wrapped in parentheses.
• VALUE fields can contain numeric expressions with '+', '-', '*' and '/'. When comparing with large fields, "_" matches any character.