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Days from SHHS1 to SHHS2

I hope you're doing well. I have a couple of questions:

1. I'm in search of the variable that represents "Days taken from SHHS visit 1 to SHHS visit 2." Could you please guide me on which variable I should be examining for this information?
2. I'm a bit uncertain about the term "Interim Follow-up." Is it distinct from SHHS visit 2, or are they related in some way? Thank you very much for your assistance in advance!

Best regards, JL

Thanks for using the NSRR!

For your first question, these variables are where I would start:

• https://sleepdata.org/datasets/shhs/variables/stdatep (days between the home sleep tests specifically)
• https://sleepdata.org/datasets/shhs/variables/formdate_sh (days between the Visit 1 home sleep test and filling out a Sleep Habits form for Visit 2)

The Interim Follow-up was a distinct visit. No home sleep test; the visit consisted of a couple sleep-related forms, weight/BP measurements (if there was an in-clinic portion), and questions about cardiovascular events since Visit 1.

Wow, thank you very much for your prompt help. I appreciate it! Sincerely, JL