condition mean min max ZT0-3 266.924987 266.924987 266.924987 ZT4-7 264.00078 264.00078 264.00078 ZT8-11 166.433764 166.433764 166.433764 ZT12-15 179.539223 179.539223 179.539223 ZT16-19 97.8204055 97.8204055 97.8204055 ZT20-23 85.12338650000001 85.12338650000001 85.12338650000001