condition mean min max ZT0-3 3.3757703825000003 1.189929655 5.56161111 ZT4-7 0.37914147350000005 0.229261797 0.52902115 ZT8-11 5.6246921455 2.903307063 8.346077228 ZT12-15 7.508020881 6.825724746500001 8.1903170155 ZT16-19 5.024896323749999 4.709864427 5.339928220499999 ZT20-23 7.134883755500001 6.940863464 7.328904047