Thank you for being part of Gemini for the last 11-12 years. Please find the links for the online parent questionnaire and game below. If possible, try to complete the whole questionnaire (35 to 40 minutes) and the online game (10 minutes) in a single session. Please complete the questionnaire on a laptop, a desktop or a tablet. Please do not do the online game on a mobile phone or a tablet.

Body measurements

In the questionnaire we will ask you to measure your and your twins'waist circumferences using the tape measure and instructions we sent you by post. You will also need to have measured the twins’ heights and weights and to have made a note of all the measurements before completing the questionnaire so you can enter them when prompted. Watch the short instruction video on the right which shows you how to measure waist circumference correctly.


  • Don't use your browser's navigation buttons (e.g., Back or Refresh) during the study, as this could cause some of your progress to be lost.

  • Once you press 'submit' or 'save and return' you can't go back and change your answers

  • If you need to take a break, or your session is interrupted, you can log in again later by clicking save and return and making a note of the return code.

  • If you have any technical problems, try closing your browser and logging in again, or using a different browser. 

Online game

  •  When you click on the online game you will be directed to download the Inquisit.exe software.

  • Once the software is downloaded you can open it and start the games. The games will take approximately 10 minutes overall.

  • You can complete the games on a laptop or a desktop. 

  • Please do not do the online game on a mobile phone or a tablet.

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© 2007-present, Gemini Research - Health and Development, all rights reserved. 

Proudly created by Alice Kininmonth

Gemini Research, Department of Behavioural Science and Health, University College London, London, WC1E 7HB | Tel: 020 7679 1263