condition mean min max ZT0-3 613.683635 613.683635 613.683635 ZT4-7 697.058631 697.058631 697.058631 ZT8-11 773.447189 773.447189 773.447189 ZT12-15 826.3252875000001 826.3252875000001 826.3252875000001 ZT16-19 735.2877595 735.2877595 735.2877595 ZT20-23 499.08111199999996 499.08111199999996 499.08111199999996