condition mean min max ZT0-3 17.24701 17.24701 17.24701 ZT4-7 22.4038805 22.4038805 22.4038805 ZT8-11 18.688288 18.688288 18.688288 ZT12-15 17.868393 17.868393 17.868393 ZT16-19 18.531191 18.531191 18.531191 ZT20-23 17.308508500000002 17.308508500000002 17.308508500000002