A Mobile App to Provide Evidence-Based Information About Crystal Methamphetamine (Ice) to the Community (Cracks in the Ice): Co-Design and Beta Testing.

While a higher number of participants agreed they had some knowledge of crystal methamphetamine or were very knowledgeable about the drug after using the app (compared with prior to using the app), this difference did not reach statistical significance; this is most likely because of the high baseline knowledge of the sample, with 82% (28/34) reporting they had at least some knowledge about crystal methamphetamine prior to using the app, therefore making it harder to see knowledge changes because of ceiling effects.

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