condition mean min max ZT0-3 14.38965 13.3773 15.402000000000001 ZT4-7 14.3875 14.3875 14.3875 ZT8-11 9.206995000000001 9.206995000000001 9.206995000000001 ZT12-15 0 0 0 ZT16-19 14.8549 14.8549 14.8549 ZT20-23 16.884149999999998 16.884149999999998 16.884149999999998