condition mean min max ZT0-3 11.053065 5.8839950000000005 14.1583 ZT4-7 9.06929 9.06929 9.06929 ZT8-11 11.325815 11.325815 11.325815 ZT12-15 18.812725 16.3042 21.32125 ZT16-19 17.5398 17.5398 17.5398 ZT20-23 16.11605 16.11605 16.11605