condition mean min max ZT0-3 14.338000000000001 14.338000000000001 14.338000000000001 ZT4-7 9.197965 9.197965 9.197965 ZT8-11 9.91525 9.91525 9.91525 ZT12-15 12.9783 12.9783 12.9783 ZT16-19 21.317050000000002 21.317050000000002 21.317050000000002 ZT20-23 17.07695 17.07695 17.07695