condition mean min max ZT0-3 19.855708339 15.470714118 24.24070256 ZT4-7 17.596704600000002 14.125293235000001 21.068115965 ZT8-11 20.575611424999998 19.684465199999998 21.466757649999998 ZT12-15 12.6022775835 9.337169867 15.867385299999999 ZT16-19 7.4949073665000014 6.632489922 8.357324811000002 ZT20-23 14.5967197465 8.3466646055 20.8467748875