condition mean min max ZT0-3 0.652137 0.652137 0.652137 ZT4-7 0.30792549999999996 0.30792549999999996 0.30792549999999996 ZT8-11 0.2549955 0.2549955 0.2549955 ZT12-15 0.1595328 0.1595328 0.1595328 ZT16-19 0.5622495000000001 0.5622495000000001 0.5622495000000001 ZT20-23 0.533594 0.533594 0.533594