condition mean min max ZT0-3 87.85955 87.85955 87.85955 ZT4-7 73.0974 73.0974 73.0974 ZT8-11 62.4615 62.4615 62.4615 ZT12-15 78.83855 78.83855 78.83855 ZT16-19 93.53115 93.53115 93.53115 ZT20-23 87.81425 87.81425 87.81425