Table 1.

Description of program type and specimen collection method

Program type	Description	Test-kit delivery	Specimen return
Outreach programs	Field staff recruited participants at their homes and collected specimens	In-person	In-person
PTK on invitation acceptance	People were invited through phone calls and/or letters to receive PTKs, those who agreed were sent a PTK	Post	Post
PTK along with invitation	People were sent PTKs along with invitation letters	Post	Post
PTK with in-person invitation	People were directly invited to receive a PTK by study personnel	In-person or post	Post
PTK without invitation	PTKs were requested through the internet or phone without any direct invitations. Various advertisement strategies were used	Post	Post, drop-off
PTK with pick-up	PTKs were picked-up from designated locations (e.g. from boxes at workplace) without direct invitations	Pick-up	Post
Multiple strategies	A combination of different strategies was used, but outcomes were not presented separately for each strategy	In-person, post or pick- up	Post

PTK, postal test kit.