condition mean min max ZT0-3 655.643149 655.643149 655.643149 ZT4-7 852.089408 852.089408 852.089408 ZT8-11 873.130596 873.130596 873.130596 ZT12-15 916.681351 916.681351 916.681351 ZT16-19 949.5734135 949.5734135 949.5734135 ZT20-23 509.1438425 509.1438425 509.1438425