condition mean min max ZT0-3 923.8 923.8 923.8 ZT4-7 739.7 739.7 739.7 ZT8-11 752.0 752.0 752.0 ZT12-15 620.1 620.1 620.1 ZT16-19 946.5500000000001 946.5500000000001 946.5500000000001 ZT20-23 856.0 856.0 856.0