condition mean min max ZT0-3 22.667675000000003 19.581 25.754350000000002 ZT4-7 9.845389999999998 9.845389999999998 9.845389999999998 ZT8-11 20.5524 20.5524 20.5524 ZT12-15 0 0 0 ZT16-19 21.19575 21.19575 21.19575 ZT20-23 17.96285 17.96285 17.96285