condition mean min max ZT0-3 28.051261 28.051261 28.051261 ZT4-7 72.0379655 72.0379655 72.0379655 ZT8-11 71.56475950000001 71.56475950000001 71.56475950000001 ZT12-15 68.5929905 68.5929905 68.5929905 ZT16-19 38.567539 38.567539 38.567539 ZT20-23 24.2704745 24.2704745 24.2704745