condition mean min max ZT0-3 32.300000000000004 32.300000000000004 32.300000000000004 ZT4-7 509.0 509.0 509.0 ZT8-11 428.35 428.35 428.35 ZT12-15 157.8 157.8 157.8 ZT16-19 77.45 77.45 77.45 ZT20-23 50.8 50.8 50.8