condition mean min max ZT0-3 22.2 22.2 22.2 ZT4-7 21.8 21.8 21.8 ZT8-11 21.049999999999997 21.049999999999997 21.049999999999997 ZT12-15 25.8 25.8 25.8 ZT16-19 41.25 41.25 41.25 ZT20-23 28.299999999999997 28.299999999999997 28.299999999999997