condition mean min max ZT0-3 2.81046 2.81046 2.81046 ZT4-7 2.029045 2.029045 2.029045 ZT8-11 1.1553685 1.1553685 1.1553685 ZT12-15 1.4169100000000001 1.4169100000000001 1.4169100000000001 ZT16-19 1.74302 1.74302 1.74302 ZT20-23 4.91143 4.91143 4.91143