condition mean min max ZT0-3 18.426524999999998 17.2919 19.561149999999998 ZT4-7 14.7349 14.7349 14.7349 ZT8-11 11.8036 11.8036 11.8036 ZT12-15 0 0 0 ZT16-19 14.058700000000002 14.058700000000002 14.058700000000002 ZT20-23 17.471600000000002 17.471600000000002 17.471600000000002