condition mean min max ZT0-3 37.01722 37.01722 37.01722 ZT4-7 29.761538 29.761538 29.761538 ZT8-11 26.0404305 26.0404305 26.0404305 ZT12-15 33.3509865 33.3509865 33.3509865 ZT16-19 23.008598 23.008598 23.008598 ZT20-23 31.501573 31.501573 31.501573