Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Numerical Rating Scale (NRS).
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Level 0: the above NRS score is 0. Level 1: the above NRS score is 1-2. Level 2: the above NRS score is 3–5. Level 3: the above NRS score is 6–9. Level 4: the above NRS score is 10. Level 8: unspecified. Level 9: not applicable.
