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Table 1 Summarized responses of each item in the conventional scale

From: Effectiveness of sexual health influencers identified by an ensemble machine learning model in promoting secondary distribution of HIV self-testing among men who have sex with men in China: study protocol for a quasi-experimental trial

Typical item

Responses Categories

Method of scaling

In the past 3 months, how often did you talk to others about HIV and STI (including both online and offline)?

Never, seldom, sometimes, often, always.

5-point Likert scale, from 0 (never) to 4 (always).

In the past 3 months, how much information about HIV and STI did you provide to others (including both online and offline)?

No information provided, provided with a little information, provided with some information, provided with much information, provided with massive information.

5-point Likert scale, from 0 (no information provided) to 4 (provided with massive information).

In the past 3 months, how many people did you tell about HIV and STI (including both online and offline)?

None, few people, some people, many people, a lot of people.

5-point Likert scale, from 0 (none), 4 (a lot of people).

In the past 3 months, how likely were you to be asked for more information about HIV and STI (including both online and offline)?

Very unlikely, unlikely, neutral, likely, very likely.

5-point Likert scale, from 0 (very unlikely) to 4 (very likely).

In the past 3 months, who communicated more information about HIV and STI: you or others within your social network (including both online and offline)?

All information was told by others, most of information was told by others, information that others told me about was as much as I told them, most of information was told by me, all information was told by me.

5-point Likert scale, from 0 (all information was told by others) to 4 (all information was told by me).

In the past 3 months, how often were you to be asked for advice about HIV and STI (including both online and offline)?

Never, seldom, sometimes, often, always.

5-point Likert scale, from 0 (never) to 4 (always).