condition mean min max ZT0-3 6.303480754000001 5.198443488000001 7.408518020000001 ZT4-7 8.5344138475 7.933608354 9.135219340999999 ZT8-11 12.246569825 11.788675835 12.704463815 ZT12-15 12.1999699625 11.337275720000001 13.062664205 ZT16-19 17.05984724 15.640465065 18.479229415 ZT20-23 19.791655655 19.522636249999998 20.06067506