condition mean min max ZT0-3 4.68845 4.17144 5.20546 ZT4-7 3.4633350000000003 3.4633350000000003 3.4633350000000003 ZT8-11 2.485405 2.485405 2.485405 ZT12-15 0 0 0 ZT16-19 4.34642 4.34642 4.34642 ZT20-23 4.022345 4.022345 4.022345