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. 2021 May 26;16(5):e0251296. doi: 10.1371/journal.pone.0251296

Table 1. Demographics of study participants.

	Inactive participants^a	Week 11 participants^b	Final cohort
n	992	180	3,653
Age (mean, SD)	25.2, 9.9 years	22.5, 6.8 years	30.0, 12.2 years
Sex (n, %)	Female: 561, 56.6%	Female: 96, 53.3%	Female: 1,964, 53.8%
	Male: 422, 42.5%	Male: 83, 46.1%	Male: 1,668, 45.7%
	Other: 4, 0.4%	Other: 0, 0.0%	Other: 10, 0.3%
	Unspecified: 5, 0.5%	Unspecified: 1, 0.6%	Unspecified: 11, 0.3%
Number of tests (n, %)	0 appointments: 992, 100%	1 appointment: 180, 100%	1 appointment: 1,163, 31.8%
			2–4 appointments: 1,505, 41.2%
			5–8 appointments: 886, 24.3%
			>8 appointments: 99, 2.7%

^aInactive participants are those who signed up for IGI FAST but, despite not taking any tests, may have taken the exit survey.

^bWeek 11 participants only participated during week 11 when samples were primarily rejected due to supply-chain issues.