condition mean min max ZT0-3 8.19795 7.383025 9.012875000000001 ZT4-7 7.010155 7.010155 7.010155 ZT8-11 5.681839999999999 5.681839999999999 5.681839999999999 ZT12-15 0 0 0 ZT16-19 8.865179999999999 8.865179999999999 8.865179999999999 ZT20-23 8.31753 8.31753 8.31753