condition mean min max ZT0-3 4.50384 3.971935 5.035745 ZT4-7 5.373895 5.373895 5.373895 ZT8-11 5.7560899999999995 5.7560899999999995 5.7560899999999995 ZT12-15 0 0 0 ZT16-19 4.6201 4.6201 4.6201 ZT20-23 5.145085 5.145085 5.145085