condition mean min max ZT0-3 41.591872 41.591872 41.591872 ZT4-7 31.2861515 31.2861515 31.2861515 ZT8-11 28.8097595 28.8097595 28.8097595 ZT12-15 36.121821000000004 36.121821000000004 36.121821000000004 ZT16-19 26.1336955 26.1336955 26.1336955 ZT20-23 22.0878985 22.0878985 22.0878985