condition mean min max ZT0-3 12.11496 12.11496 12.11496 ZT4-7 13.6847195 13.6847195 13.6847195 ZT8-11 13.1583635 13.1583635 13.1583635 ZT12-15 19.214959999999998 19.214959999999998 19.214959999999998 ZT16-19 15.220172000000002 15.220172000000002 15.220172000000002 ZT20-23 57.0459515 57.0459515 57.0459515