condition mean min max ZT0-3 7.368721666666667 5.6796050000000005 9.263745 ZT4-7 4.78892 4.78892 4.78892 ZT8-11 11.894715000000001 11.894715000000001 11.894715000000001 ZT12-15 13.6344 11.51525 15.75355 ZT16-19 7.496235 7.496235 7.496235 ZT20-23 9.619230000000002 9.619230000000002 9.619230000000002