condition mean min max ZT0-3 3.1155325 3.037055 3.19401 ZT4-7 6.10551 6.10551 6.10551 ZT8-11 4.00304 4.00304 4.00304 ZT12-15 0 0 0 ZT16-19 3.8278049999999997 3.8278049999999997 3.8278049999999997 ZT20-23 4.048735 4.048735 4.048735