Thanks for your question and your interest in the PACT Healthcare App Challenge.
The extent that the NHANES data is used within your application is up to you. However, I would recommend that you explain how it was used in your submission video and text description.
Per Section 4b of the official rules:
"Makers must create a working software application that is consumer facing and focuses on helping chronically ill diabetes patients lower medical costs through proactive condition management, such as improving their health behaviors (medication adherence, diet, exercise, or other behaviors impacting health) (each an “Application”). Applications must use one or more of the NHANES datasets provided at: http://www.cdc.gov/nchs/nhanes/nhanes_questionnaires.htm. Applications should account for sustained usage and caregiver support in their design."