condition mean min max ZT0-3 1355.652628 1355.652628 1355.652628 ZT4-7 1221.9037325 1221.9037325 1221.9037325 ZT8-11 1149.6200534999998 1149.6200534999998 1149.6200534999998 ZT12-15 1207.9328245000002 1207.9328245000002 1207.9328245000002 ZT16-19 1297.8792134999999 1297.8792134999999 1297.8792134999999 ZT20-23 992.5183405 992.5183405 992.5183405