condition mean min max ZT0-3 10.23458317225 8.953714437999999 11.515451906500001 ZT4-7 17.0659825125 13.282176119999999 20.849788905 ZT8-11 27.993782305 24.251870755 31.735693855 ZT12-15 18.3559169625 13.5244937 23.187340225 ZT16-19 8.747140235749999 8.611647836 8.8826326355 ZT20-23 10.151981091749999 9.810873924 10.493088259499999