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Reporting it on Schedule 1, 8z is accurate. This is other income not subject to self-employment.

It sounds like you followed the correct way to enter it:

Income from a health study is 'Other Income' and is not subject to self-employment. The amount will be in box 3 of your 1099-Misc.

Take the following steps:   

1. Sign in to TurboTax Online, click  Continue your return, then pick up where I left off (if you are using TurboTax CD/ Download, then just open your return on your computer);  
2. Click on Federal Taxes at the top of the screen;  
3. Scroll down the page to the last section titled: 1099-Misc and Other Common Income;  
4. Select start or update next to the topic titled Income from Form 1099-Misc;  
5. Answer Yes, to the questions Did you get a 1099-Misc?; 
6. Enter the information from your 1099-Misc; 
7. Enter Medical Study for a reason for the 1099-Misc; 
8. For uncommon situations, select [Name] was in a research study and this was the payment; 
9. You will then be asked if you perform a service to earn the money, say No. 
10. If you entered this any other way, make sure to delete the other entries.