condition mean min max ZT0-3 8.05 8.05 8.05 ZT4-7 8.9 8.9 8.9 ZT8-11 36.25 36.25 36.25 ZT12-15 6.9 6.9 6.9 ZT16-19 23.299999999999997 23.299999999999997 23.299999999999997 ZT20-23 24.1 24.1 24.1