condition mean min max ZT0-3 149.78387 149.78387 149.78387 ZT4-7 147.912163 147.912163 147.912163 ZT8-11 79.700689 79.700689 79.700689 ZT12-15 132.243177 132.243177 132.243177 ZT16-19 37.142920000000004 37.142920000000004 37.142920000000004 ZT20-23 22.009264 22.009264 22.009264