condition mean min max ZT0-3 16.531716 16.531716 16.531716 ZT4-7 12.3084215 12.3084215 12.3084215 ZT8-11 12.4317785 12.4317785 12.4317785 ZT12-15 10.7082105 10.7082105 10.7082105 ZT16-19 12.2799025 12.2799025 12.2799025 ZT20-23 12.281729 12.281729 12.281729