condition mean min max ZT0-3 29.363858 29.363858 29.363858 ZT4-7 88.898748 88.898748 88.898748 ZT8-11 73.9176615 73.9176615 73.9176615 ZT12-15 73.850698 73.850698 73.850698 ZT16-19 51.126231000000004 51.126231000000004 51.126231000000004 ZT20-23 48.527679 48.527679 48.527679