condition mean min max ZT0-3 43.45693333333333 43.45693333333333 43.45693333333333 ZT4-7 57.935 57.935 57.935 ZT8-11 27.983249999999998 27.983249999999998 27.983249999999998 ZT12-15 18.594050000000003 18.594050000000003 18.594050000000003 ZT16-19 14.0542 14.0542 14.0542 ZT20-23 21.0301 21.0301 21.0301