condition mean min max ZT0-3 1316.912845075 663.9362518999999 1969.88943825 ZT4-7 4054.14400975 3783.7611785 4324.526841 ZT8-11 3872.8458379999997 3509.2976684999994 4236.3940075 ZT12-15 1542.313308075 957.2682571500001 2127.358359 ZT16-19 698.821833875 690.1395566000001 707.50411115 ZT20-23 539.030529225 418.3285652999999 659.73249315