Table 4.

Characteristics to be identified and collected through data linkage for SID-Cymru cases and controls

Data	Characteristics
Demographics	Sex
	Date of birth
	Marital status*
	Employment*
	Education*
Mortality	DOD
	Age at DOD (in years)
	Registered date of death
	Cause of death (ICD-10 code)
Deprivation	LSOA
	WIMD
	Townsend
	Rural–urban indicators
Medical history	GP register*
	GP diagnosis (Read Code)*
	GP events*
	Hospital attendance
	Hospital diagnosis
	Hospital events
	Outpatient attendance
	Outpatient diagnosis*
	Outpatient events
	ED attendance*
	ED diagnosis*
	ED events*
	Psychiatric admission*

*Where data are available; there may be limitations to the number of cases with this information.

DOD, date of death; ED, emergency department; GP, general practice; ICD-10, International Classification of Disease, Tenth Revision; LSOA, lower super output area; SID, Suicide Information Database; WIMD, Welsh Index of Multiple Deprivation.