condition mean min max ZT0-3 417.6 417.6 417.6 ZT4-7 538.0 538.0 538.0 ZT8-11 417.45000000000005 417.45000000000005 417.45000000000005 ZT12-15 482.5 482.5 482.5 ZT16-19 568.45 568.45 568.45 ZT20-23 618.3 618.3 618.3