condition mean min max ZT0-3 1.0182195 0.9327825 1.1036565 ZT4-7 1.629245 1.629245 1.629245 ZT8-11 0.68346 0.68346 0.68346 ZT12-15 0 0 0 ZT16-19 1.162615 1.162615 1.162615 ZT20-23 0.6763905 0.6763905 0.6763905