condition mean min max ZT0-3 19.257183333333334 11.2044 23.92325 ZT4-7 12.28455 12.28455 12.28455 ZT8-11 11.63375 11.63375 11.63375 ZT12-15 19.453924999999998 17.4861 21.42175 ZT16-19 19.7834 19.7834 19.7834 ZT20-23 25.4747 25.4747 25.4747