condition mean min max ZT0-3 32.181974999999994 30.118049999999997 34.2459 ZT4-7 28.4004 28.4004 28.4004 ZT8-11 22.66 22.66 22.66 ZT12-15 0 0 0 ZT16-19 33.62955 33.62955 33.62955 ZT20-23 35.7774 35.7774 35.7774