condition mean min max ZT0-3 279.096521 279.096521 279.096521 ZT4-7 204.539749 204.539749 204.539749 ZT8-11 212.8103405 212.8103405 212.8103405 ZT12-15 255.15568000000002 255.15568000000002 255.15568000000002 ZT16-19 298.0486645 298.0486645 298.0486645 ZT20-23 301.12269449999997 301.12269449999997 301.12269449999997