condition mean min max ZT0-3 242.616672 242.616672 242.616672 ZT4-7 367.0603695 367.0603695 367.0603695 ZT8-11 289.62902599999995 289.62902599999995 289.62902599999995 ZT12-15 612.181368 612.181368 612.181368 ZT16-19 823.825844 823.825844 823.825844 ZT20-23 887.4510620000001 887.4510620000001 887.4510620000001