. 2023 Feb 22;20(5):3883. doi: 10.3390/ijerph20053883

Table 1.

Keywords used for searching.

Databases	Search Strings
Scopus	(1) TITLE-ABS-KEY((“prevalence” OR “use” OR “epidemiology”) AND (“E-cigarette” OR “vape” OR “electronic cigarette” OR “Electronic Nicotine Delivery System”) AND (“youth” OR “adolescent” OR “child”) AND (“Southeast asia” OR “Brunei” OR “Myanmar” OR “Cambodia” OR “Timor-leste” OR “Indonesia” OR “Laos” OR “Malaysia” OR “Philippines” OR “Singapore” OR “Thailand” OR “Vietnam”)) (2) TITLE-ABS-KEY((“risk factor” OR “predictor” OR “associated factor” OR “association” OR “correlate” OR “determinant”) AND (“E-cigarette” OR “vape” OR “electronic cigarette” OR “Electronic Nicotine Delivery System”) AND (“youth” OR “adolescent*” OR “child”) AND (“Southeast asia” OR “Brunei” OR “Myanmar” OR “Cambodia” OR “Timor-leste” OR “Indonesia” OR “Laos” OR “Malaysia” OR “Philippines” OR “Singapore” OR “Thailand” OR “Vietnam”))
Web of Science	(1) ((ALL=(prevalence)) OR ALL=(use)) OR ALL=(epidemiology) AND (((ALL=(E-cigarette)) OR ALL=(vape)) OR ALL=(electronic cigarette)) OR ALL=(Electronic Nicotine Delivery System) AND ((ALL=(youth)) OR ALL=(adolescent)) OR ALL=(child) AND (((((((((((ALL=(Southeast asia)) OR ALL=(Brunei)) OR ALL=(Myanmar)) OR ALL=(Cambodia)) OR ALL=(Timor-leste)) OR ALL=(Indonesia)) OR ALL=(Laos)) OR ALL=(Malaysia)) OR ALL=(Philippines)) OR ALL=(Singapore)) OR ALL=(Thailand)) OR ALL=(Vietnam) (2) ((((ALL=(risk factor)) OR ALL=(predictor)) OR ALL=(associated factor)) OR ALL=(association)) OR ALL=(correlate)AND (((ALL=(E-cigarette)) OR ALL=(vape)) OR ALL=(electronic cigarette)) OR ALL=(Electronic Nicotine Delivery System) AND ((ALL=(youth)) OR ALL=(adolescent)) OR ALL=(child) AND (((((((((((ALL=(Southeast asia)) OR ALL=(Brunei)) OR ALL=(Myanmar)) OR ALL=(Cambodia)) OR ALL=(Timor-leste)) OR ALL=(Indonesia)) OR ALL=(Laos)) OR ALL=(Malaysia)) OR ALL=(Philippines)) OR ALL=(Singapore)) OR ALL=(Thailand)) OR ALL=(Vietnam)
PubMed	(1) (((((“prevalence”) OR (“use”)) OR (“epidemiology”)) AND ((((“E-cigarette”) OR (“vape”)) OR (“electronic cigarette”)) OR (“Electronic Nicotine Delivery System”))) AND (((“youth”) OR (“adolescent”)) OR (“child”))) AND (((((((((((((“Southeast asia”) OR (“Brunei”)) OR (“Myanmar”)) OR (“Cambodia”)) OR (“Timor-leste”)) OR (“Indonesia”))) OR (“Laos”)) OR (“Malaysia”)) OR (“Philippines”)) OR (“Singapore”)) OR (“Thailand”)) OR (“Vietnam”)) (2) ((((((((“risk factor”) OR (“predictor”)) OR (“associated factor”)) OR (“association”)) OR (“correlate”)) OR (“determinant”)) AND ((((“E-cigarette”) OR (“vape”)) OR (“electronic cigarette”)) OR (“Electronic Nicotine Delivery System”))) AND (((“youth”) OR (“adolescent*”)) OR (“child”))) AND (((((((((((((“Southeast asia”) OR (“Brunei”)) OR (“Myanmar”)) OR (“Cambodia”)) OR (“Timor-leste”)) OR (“Indonesia”))) OR (“Laos”)) OR (“Malaysia”)) OR (“Philippines”)) OR (“Singapore”)) OR (“Thailand”)) OR (“Vietnam”))

The asterisk symbol (*) was used as a wildcard to increase variability of keywords to be identified.