condition mean min max ZT0-3 9.160707500000001 7.897325 10.42409 ZT4-7 5.795495 5.795495 5.795495 ZT8-11 3.2908349999999995 3.2908349999999995 3.2908349999999995 ZT12-15 0 0 0 ZT16-19 1.2354020000000001 1.2354020000000001 1.2354020000000001 ZT20-23 2.51828 2.51828 2.51828