condition mean min max ZT0-3 2885.2 2885.2 2885.2 ZT4-7 1990.8 1990.8 1990.8 ZT8-11 1458.35 1458.35 1458.35 ZT12-15 505.25 505.25 505.25 ZT16-19 31.05 31.05 31.05 ZT20-23 599.95 599.95 599.95