condition mean min max ZT0-3 36.689875 34.1942 39.18555 ZT4-7 31.4304 31.4304 31.4304 ZT8-11 29.982300000000002 29.982300000000002 29.982300000000002 ZT12-15 0 0 0 ZT16-19 33.4989 33.4989 33.4989 ZT20-23 35.2791 35.2791 35.2791