condition mean min max ZT0-3 19.391673 19.391673 19.391673 ZT4-7 11.9028505 11.9028505 11.9028505 ZT8-11 10.824966 10.824966 10.824966 ZT12-15 13.0691575 13.0691575 13.0691575 ZT16-19 10.988828999999999 10.988828999999999 10.988828999999999 ZT20-23 14.086492499999999 14.086492499999999 14.086492499999999