condition mean min max ZT0-3 8.1039225 7.994505 8.21334 ZT4-7 12.887104999999998 12.887104999999998 12.887104999999998 ZT8-11 19.52975 19.52975 19.52975 ZT12-15 0 0 0 ZT16-19 19.59265 19.59265 19.59265 ZT20-23 14.5093 14.5093 14.5093