condition mean min max ZT0-3 12.616 12.616 12.616 ZT4-7 11.16235 11.16235 11.16235 ZT8-11 11.6623 11.6623 11.6623 ZT12-15 11.90795 11.90795 11.90795 ZT16-19 13.613949999999999 13.613949999999999 13.613949999999999 ZT20-23 11.8662 11.8662 11.8662