condition mean min max ZT0-3 12.924383333333333 7.1594 16.861800000000002 ZT4-7 6.91745 6.91745 6.91745 ZT8-11 12.0334 12.0334 12.0334 ZT12-15 12.230677499999999 10.545655 13.9157 ZT16-19 12.6558 12.6558 12.6558 ZT20-23 16.99065 16.99065 16.99065