condition mean min max ZT0-3 2.3999075 1.9427249999999998 2.85709 ZT4-7 3.036975 3.036975 3.036975 ZT8-11 4.450655 4.450655 4.450655 ZT12-15 0 0 0 ZT16-19 7.564715 7.564715 7.564715 ZT20-23 4.6477900000000005 4.6477900000000005 4.6477900000000005