Relationship	Specification	Example
Proximity	An occurrence of one feature within a given number of days of the other but with no specification of which should come first	Pain and fatigue within 90 days of each other
Following	An occurrence of one feature within a given number of days of the other with specification of which should come first	Pain occurring within 90 days of estimated cessation of contraception
Separated	Two consecutive recordings of a single feature occurring at least a given number of days apart (this permits differentiation of separate episodes from repeated consultation during the same episode)	Two consecutive episodes of pain separated by at least 180 days
During	An occurrence of a symptom or other feature after the onset, and before the expected offset, of a contraception prescription	Pain during estimated duration of prescription for contraception
Exclusive	A feature only occurring in the absence of another	Pain but only outside of estimated periods of prescribed contraception