condition mean min max ZT0-3 38.521058 38.521058 38.521058 ZT4-7 35.156767 35.156767 35.156767 ZT8-11 40.274724000000006 40.274724000000006 40.274724000000006 ZT12-15 52.5820625 52.5820625 52.5820625 ZT16-19 63.5952535 63.5952535 63.5952535 ZT20-23 60.817576 60.817576 60.817576