condition mean min max ZT0-3 4.644112499999999 4.246589999999999 5.041634999999999 ZT4-7 2.52094 2.52094 2.52094 ZT8-11 3.869115 3.869115 3.869115 ZT12-15 0 0 0 ZT16-19 4.793324999999999 4.793324999999999 4.793324999999999 ZT20-23 6.82105 6.82105 6.82105