condition mean min max ZT0-3 1.1294128333333335 0.0 1.7332420000000002 ZT4-7 0.83021 0.83021 0.83021 ZT8-11 0.0 0.0 0.0 ZT12-15 0.42940075 0.2735445 0.585257 ZT16-19 1.6003349999999998 1.6003349999999998 1.6003349999999998 ZT20-23 2.100715 2.100715 2.100715