condition mean min max ZT0-3 2969.424364 2969.424364 2969.424364 ZT4-7 1928.3042679999999 1928.3042679999999 1928.3042679999999 ZT8-11 1073.0220555 1073.0220555 1073.0220555 ZT12-15 748.1199300000001 748.1199300000001 748.1199300000001 ZT16-19 266.2614275 266.2614275 266.2614275 ZT20-23 173.1645725 173.1645725 173.1645725