condition mean min max ZT0-3 15.93825 15.93825 15.93825 ZT4-7 16.74945 16.74945 16.74945 ZT8-11 14.309149999999999 14.309149999999999 14.309149999999999 ZT12-15 19.12135 19.12135 19.12135 ZT16-19 20.8553 20.8553 20.8553 ZT20-23 15.9654 15.9654 15.9654