condition mean min max ZT0-3 24.6 24.6 24.6 ZT4-7 32.8 32.8 32.8 ZT8-11 31.849999999999998 31.849999999999998 31.849999999999998 ZT12-15 27.35 27.35 27.35 ZT16-19 37.0 37.0 37.0 ZT20-23 21.35 21.35 21.35