condition mean min max ZT0-3 208.327241 208.327241 208.327241 ZT4-7 118.64353249999999 118.64353249999999 118.64353249999999 ZT8-11 147.4694795 147.4694795 147.4694795 ZT12-15 184.79102849999998 184.79102849999998 184.79102849999998 ZT16-19 244.327443 244.327443 244.327443 ZT20-23 223.8406915 223.8406915 223.8406915