condition mean min max ZT0-3 52.672025 51.02095 54.3231 ZT4-7 51.88425 51.88425 51.88425 ZT8-11 65.66890000000001 65.66890000000001 65.66890000000001 ZT12-15 0 0 0 ZT16-19 100.81450000000001 100.81450000000001 100.81450000000001 ZT20-23 85.7933 85.7933 85.7933