Table 2.

Prompt Design for Mental Health Prediction Tasks. ${\mathit{\text{Prompt}}}_{\mathit{\text{Part1-S}}}$ aims to provide a better specification for LLMs and ${\mathit{\text{Prompt}}}_{\mathit{\text{Part2-Q}}}$ poses the questions for LLMs to answer. For Part 1, we propose three strategies: context enhancement, mental health enhancement, and the combination of both. As for Part 2, we design different content for multiple mental health problem categories and prediction tasks. For each part, we propose two to three versions to improve its variation.

Strategy		${\mathit{\text{Prompt}}}_{\mathit{\text{Part1-S}}}$
Basic		{blank}
Context Enhancement		This person wrote this paragraph on social media. Consider this post on social media to answer the question.
Mental Health Enhancement		As a psychologist, read the post on social media and answer the question. If you are a psychologist, read the post on social media and answer the question.
Context & Mental Health Enhancement		This person wrote this paragraph on social media. As a psychologist, read the post on social media and answer the question. This person wrote this paragraph on social media. As a psychologist, consider the mental well-being condition expressed in this post, read the post on social media, and answer the question.
Category	Task	${\mathit{\text{Prompt}}}_{\mathit{\text{Part2-Q}}}$
Mental state (e.g., stressed, depressed)	Binary classification (e.g., yes or no)	Is the poster [stressed]? Is the poster of this post [stressed]? Determine if the poster of this post is [stressed].
	Multi-class classification (e.g., multiple levels)	Which level is the person [stressed]? How [stressed] is the person? Determine how [stressed] the person is.
Critical risk action (e.g., suicide)	Binary classification (e.g., yes or no)	Does the poster want to [suicide]? Is the poster likely to [suicide]? Determine if the poster of this post want to [suicide].
	Multi-class classification (e.g., multiple levels)	Which level of [suicide] risk does the person have? How [suicidal] is the person? Determine which level of [suicide] risk does the person have.