condition mean min max ZT0-3 2.4567625 2.29999 2.6135349999999997 ZT4-7 2.2669750000000004 2.2669750000000004 2.2669750000000004 ZT8-11 1.755325 1.755325 1.755325 ZT12-15 0 0 0 ZT16-19 2.397495 2.397495 2.397495 ZT20-23 1.84627 1.84627 1.84627