Suicide helpline tries callbacks to keep people safe

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

1. Callers Inclusion criteria: * The caller is 18 years or older. * The caller speaks Dutch. * The caller calls the Zelfmoordlijn 1813 for themselves due to suicidal ideation. * The caller must benefit from callback conversations fitting one of the three callback profiles. * The caller is not a frequent caller to the Zelfmoordlijn 1813. * The caller can be called back directly on a personal device. * The caller is legally competent, meaning they can oversee the potential consequences of participation, such as time investment and availability. * At the time of recruitment, the caller is not receiving support within a care trajectory where attention is paid to their suicidality. Or the care provider is not available quickly enough (e.g., due to maternity leave) if the caller falls within the callback profile focusing on a safety conversation. Exclusion criteria: * The caller is younger than 18 years. * The caller does not speak Dutch. * The caller does not call the Zelfmoordlijn 1813 for themselves. * The caller is a frequent caller to the Zelfmoordlijn 1813. * The call responder assesses that urgent medical help is necessary. * The caller expresses a homocide threat during the original conversation to the Zelfmoordlijn 1813. * The caller cannot be called back on a personal device (e.g., persons in detention). * The caller is not legally competent to oversee the consequences of participation (e.g., under the influence of alcohol and/or drugs). * At the time of recruitment, the caller is receiving support within a care trajectory where attention is paid to their suicidality. 2. Call responders The CPZ chooses to recruit call responders who have extensive experience in answering calls at the Zelfmoordlijn 1813. Therefore, not all call responders of the Zelfmoordlijn 1813 are trained to recruit callers. 3. Callback callers The staff members of the CPZ who are involved in developing and implementing the callback methodology will also participate in the research by means of an interview.