Source	Search strategy	Hits retrieved
1. Medline In‐process and other non‐indexed citations and MEDLINE 1950‐present (Ovid SP)	1. IQCODE.ti,ab. 2. "informant questionnaire on cognitive decline in the elderly".ti,ab. 3. "IQ code".ti,ab. 4. ("informant* questionnair*" adj3 (dement* or screening)).ti,ab. 5. ("screening test*" adj2 (dement* or alzheimer*)).ti,ab. 6. or/1‐5	Apr 2011: 291 Jul 2012: 39 Jan 2013: 19
2. Embase 1980‐2013 January 10 (Ovid SP)	1. IQCODE.ti,ab. 2. "informant questionnaire on cognitive decline in the elderly".ti,ab. 3. "IQ code".ti,ab. 4. ("informant* questionnair*" adj3 (dement* or screening)).ti,ab. 5. ("screening test*" adj2 (dement* or alzheimer*)).ti,ab. 6. or/1‐5	Apr 2011: 356 Jul 2012: 49 Jan 2013: 44
3. PsycINFO 1806‐January week 2 2013 (Ovid SP)	1. IQCODE.ti,ab. 2. "informant questionnaire on cognitive decline in the elderly".ti,ab. 3. "IQ code".ti,ab. 4. ("informant* questionnair*" adj3 (dement* or screening)).ti,ab. 5. ("screening test*" adj2 (dement* or alzheimer*)).ti,ab. 6. or/1‐5	Apr 2011: 215 Jul 2012: 28 Jan 2013: 17
4. BIOSIS Previews 1926 to present (Thomson Reuters Web of Science)	Topic=(IQCODE OR "informant questionnaire on cognitive decline in the elderly" OR "IQ code") AND Topic=(dement* OR alzheimer* OR FTLD OR FTD OR "primary progressive aphasia" OR "progressive non‐fluent aphasia" OR "frontotemporal lobar degeneration" OR "frontolobar degeneration" OR "frontal lobar degeneration" OR "pick* disease" OR "lewy bod*") Timespan=All Years. Databases=SCI‐EXPANDED, SSCI, A&HCI, CPCI‐S, CPCI‐SSH, BKCI‐S, BKCI‐SSH. Lemmatization=On	Apr 2011: 84 Jul 2012: 12 Jan 2013: 2
5. Web of Science Core Collection (includes Conference Proceedings Citation Index) 1945‐present (Thomson Reuters Web of Science)	Topic=(IQCODE OR "informant questionnaire on cognitive decline in the elderly" OR "IQ code") AND Topic=(dement* OR alzheimer* OR FTLD OR FTD OR "primary progressive aphasia" OR "progressive non‐fluent aphasia" OR "frontotemporal lobar degeneration" OR "frontolobar degeneration" OR "frontal lobar degeneration" OR "pick* disease" OR "lewy bod*") Timespan=All Years. Databases=SCI‐EXPANDED, SSCI, A&HCI, CPCI‐S, CPCI‐SSH, BKCI‐S, BKCI‐SSH. Lemmatization=On	Apr 2011: 184 Jul 2012: 24 Jan 2013: 13
6. LILACS (BIREME)	“short‐IQCODE” OR IQCODE OR “IQ code” OR “Informant Questionnaire” OR “Informant Questionnaires”	Apr 2011: 10 Jul 2012: 0 Jan 2013: 0
7. CINAHL (EBSCOhost)	S1 TX IQCODE S2 TX "informant questionnaire" S3 TX "IQ code" S4 TX screening instrument S5 S1 or S2 or S3 or S4 S6 (MM "Dementia+") S7 TX dement* S8 TX alzheimer* S9 S6 or S7 or S8 S10 S5 and S9	Apr 2011: 231 Jul 2012: 53 Jan 2013: 12
8. Additional other review sources: MEDION database (searched 31 Jan for all dates); Database of Abstracts of Reviews of Effects (searched Issue 1 of the Cochrane Library 2013); Health Technology Assessment Database (searched Issue 1 of the Cochrane Library 2013); ARIF: Aggressive Research Intelligence Facility www.arif.bham.ac.uk (searched 31 Jan for all dates)	Jan 2013: 3
9 ALOIS (see Appendix 6 for the Medline strategy used to populate ALOIS)	Jan 2013: 22
TOTAL before de‐duplication of search results	Apr 2011: 1361 Jul 2012: 215 Jan 2013: 107 (+3 from additional review sources) TOTAL: 1708
TOTAL after de‐duplification and first‐assess by the Trials Search Co‐ordinator	71