Unable to save confidence interval after multiple testing

[crobro254]

I'd like to save confidence intervals after testing multiple parameter with boottest, but I found the r(CI) and the r(CIstr) are both empty after multiple testing, I wrote the following test code and uploaded my saved log, may you kindly offer a solution such that I can save those confidence intervals instead of manually retrieving them from log?

log using boot_mul_noci, text
sysuse auto, clear
eststo testreg: reg price mpg gear_ratio
boottest {mpg} {gear_ratio} , nograph
mat ci = r(CI)
mat l ci
estadd local CIstr "`r(CIstr)'"
esttab testreg
log close

boot_mul_noci.log