Table 2.

Study metadata and population characteristics.

Study	Year	Country	Participants, n	Male, n	Medical conditions	Age (years)	Duration of data collection
Hina et al [22]	2020	Pakistan	200	112	Diabetics	18-71	N/Aa
Alfian et al [23]	2018	Switzerland	71	N/A	Diabetics	NRb	Months
Alarcon-Paredes et al [24]	2019	Mexico	514	N/A	N/A	18-44	Minutes
Islam et al [8]	2019	Bangladesh	25	N/A	Diabetics	22-25	Days
Kularathne et al [25]	2019	Sri Lanka	50	NR	N/A	40-50	N/A
Joshi et al [26]	2020	India	46	26	N/A	24-50	Seconds
Zhou et al [27]	2019	China	8	4	Diabetics	NR	Weeks
Mahmud et al [28]	2019	Bangladesh	15	12	N/A	NR	Minutes
Bent et al [29]	2021	United States	16	7	Prediabetics	35-65	Days
Lee et al [9]	2021	Taiwan	N/A	N/A	N/A	NR	N/A
Shrestha et al [30]	2019	United States	N/A	N/A	N/A	NR	Seconds
Li et al [31]	2018	China	2	N/A	N/A	NR	N/A

^aNA: not applicable.

^bNR: not reported.