condition mean min max ZT0-3 598.693595 598.693595 598.693595 ZT4-7 381.7534215 381.7534215 381.7534215 ZT8-11 458.05419900000004 458.05419900000004 458.05419900000004 ZT12-15 386.79404250000005 386.79404250000005 386.79404250000005 ZT16-19 530.6862619999999 530.6862619999999 530.6862619999999 ZT20-23 508.26584949999994 508.26584949999994 508.26584949999994