condition mean min max ZT0-3 0.5222946666666667 0.0 0.926631 ZT4-7 1.215047 1.215047 1.215047 ZT8-11 1.85908 1.85908 1.85908 ZT12-15 0.47801625 0.3101355 0.6458969999999999 ZT16-19 1.1906755 1.1906755 1.1906755 ZT20-23 0.326981 0.326981 0.326981