condition mean min max ZT0-3 3.20165 3.16178 3.24152 ZT4-7 3.4153149999999997 3.4153149999999997 3.4153149999999997 ZT8-11 2.90808 2.90808 2.90808 ZT12-15 0 0 0 ZT16-19 3.07705 3.07705 3.07705 ZT20-23 3.5848649999999997 3.5848649999999997 3.5848649999999997