condition mean min max ZT0-3 24.212475 22.3958 26.02915 ZT4-7 45.8219 45.8219 45.8219 ZT8-11 156.672 156.672 156.672 ZT12-15 0 0 0 ZT16-19 38.35995 38.35995 38.35995 ZT20-23 29.88625 29.88625 29.88625