Figure.
The mean number of cramps per month with standard deviation (whisker lines) reported during progression of ALS. The mean number of cramps declined over time, but this trend did not reach statistical significance (P = 0.26).
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.