condition mean min max ZT0-3 5686.770518 5686.770518 5686.770518 ZT4-7 5205.9593705 5205.9593705 5205.9593705 ZT8-11 5489.132396999999 5489.132396999999 5489.132396999999 ZT12-15 5519.366672 5519.366672 5519.366672 ZT16-19 6252.024019 6252.024019 6252.024019 ZT20-23 7137.130502 7137.130502 7137.130502