condition mean min max ZT0-3 985.795384 985.795384 985.795384 ZT4-7 806.0715475 806.0715475 806.0715475 ZT8-11 865.958153 865.958153 865.958153 ZT12-15 919.3750835000001 919.3750835000001 919.3750835000001 ZT16-19 1142.5199645 1142.5199645 1142.5199645 ZT20-23 1063.851474 1063.851474 1063.851474