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You may find additional inspiration in the many many threads in these fora dealing with df and mailing its results.

Try this pure shell:df -h | { read REST; while read FS SZ AV US PC MT REST; do useSpPer=${useSpPer}'-'$PC; echo 'use '$useSpPer; echo 'res '$PC; done; echo final $useSpPer; }
use -28%
res 28%...

That behaviour is due to the loop being executed in a subshell, and the variable's contents is not given back to the parent shell.