condition mean min max ZT0-3 8.18085 6.420775 9.940925 ZT4-7 12.3863 12.3863 12.3863 ZT8-11 6.72281 6.72281 6.72281 ZT12-15 0 0 0 ZT16-19 12.43914 12.43914 12.43914 ZT20-23 18.342799999999997 18.342799999999997 18.342799999999997