How to automatically exclude a participant that gives a certain answer?

Question

The first question is an open question about age:
How old are you? ...
and the participant answer the question in an open way. We want to automatically exclude participants who answer <18 years. How to do it? And then he/she has to be redirected to another page that states like:
Thank you for participating. Unfortunately your profile is not suitable for the current study. We hope you are still interested to participate in other studies in the future. Best regards
Then we want to do it also for two others selection questions regarding psychiatric disorders and language proficiency. If they click on a certain response, they will be redirected to the page above.
Thank you very much!

Answer 1

How to do it?

Is a simple PHP filter.

if (value('AG01_01') < 18) {
  text('AG02');
  buttonHide();
  pageStop();
}

Also see pageStop().

Comments

Thank you :) where do I have to put this filter? I'm really new to sosci

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Get started with the PHP filter manual that I have linked above :)

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Thank you! :) It was quite easy, it's only a matter of practice