condition mean min max ZT0-3 448.0 448.0 448.0 ZT4-7 402.7 402.7 402.7 ZT8-11 513.7 513.7 513.7 ZT12-15 578.8 578.8 578.8 ZT16-19 541.8499999999999 541.8499999999999 541.8499999999999 ZT20-23 475.45000000000005 475.45000000000005 475.45000000000005