condition mean min max ZT0-3 27.424975 25.81335 29.0366 ZT4-7 79.2559 79.2559 79.2559 ZT8-11 97.36725 97.36725 97.36725 ZT12-15 0 0 0 ZT16-19 30.4185 30.4185 30.4185 ZT20-23 27.27955 27.27955 27.27955