condition mean min max ZT0-3 4351.950000000001 4351.950000000001 4351.950000000001 ZT4-7 7524.3 7524.3 7524.3 ZT8-11 7662.25 7662.25 7662.25 ZT12-15 5713.450000000001 5713.450000000001 5713.450000000001 ZT16-19 2782.3500000000004 2782.3500000000004 2782.3500000000004 ZT20-23 1896.2 1896.2 1896.2