condition mean min max ZT0-3 14.0417404765 8.891964683 19.19151627 ZT4-7 24.1878856075 23.270860655 25.10491056 ZT8-11 19.010745567500003 17.892111800000002 20.129379335 ZT12-15 9.39332865475 6.068726359499999 12.717930950000001 ZT16-19 8.3012162295 7.037535344 9.564897115 ZT20-23 11.36419668425 10.3674641235 12.360929245000001