condition mean min max ZT0-3 5.346495 5.211665 5.481325 ZT4-7 4.342335 4.342335 4.342335 ZT8-11 3.3164550000000004 3.3164550000000004 3.3164550000000004 ZT12-15 0 0 0 ZT16-19 4.019805 4.019805 4.019805 ZT20-23 5.106945 5.106945 5.106945