condition mean min max ZT0-3 25.049999999999997 25.049999999999997 25.049999999999997 ZT4-7 26.4 26.4 26.4 ZT8-11 31.3 31.3 31.3 ZT12-15 36.5 36.5 36.5 ZT16-19 34.1 34.1 34.1 ZT20-23 39.8 39.8 39.8