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Table 1 Arms and interventions information

From: Promoting routine syphilis screening among men who have sex with men in China: study protocol for a randomised controlled trial of syphilis self-testing and lottery incentive

Arms Intervention description Intervention delivery
Control arm 1. Test prompts: information about risk of syphilis infection and local free syphilis test services. • Text messages will be sent at enrollment, three-month visit, and six-month visit via WeChat.
• Voluntary report testing result to the platform.
Standard self-testing arm 1. Test prompts: information about risk of syphilis infection and local free syphilis test services.
2. Self-testing: free home delivery of self-testing package.
• Text messages will be sent at enrollment, three-month visit, and six-month visit via WeChat.
• Provision of syphilis self-testing service: self-testing package can be ordered online and sent to participant through postal mail. Maximum one self-testing package per month.
• Voluntary report self-test result to the platform.
Lottery incentivized self-testing arm 1. Test prompts: information about risk of syphilis infection and local free syphilis test services.
2. Self-testing: free home delivery of self-testing package.
3. Lottery incentive: lottery draw with 10% chance to win 100 RMB for participants have confirmed uptake of syphilis testing.
• Text messages will be sent at enrollment, three-month visit, and six-month visit via WeChat.
• Provision of syphilis self-testing service: self-testing package can be ordered online and sent to participant through postal mail. Maximum one self-testing package per month.
• Voluntary report self-test result to the platform.
• Lottery draw will be given to participants who get syphilis tested and upload photo verification to the platform.