condition mean min max ZT0-3 56.535275 47.933099999999996 65.13745 ZT4-7 76.46 76.46 76.46 ZT8-11 17.21505 17.21505 17.21505 ZT12-15 0 0 0 ZT16-19 38.382450000000006 38.382450000000006 38.382450000000006 ZT20-23 60.1546 60.1546 60.1546