condition mean min max ZT0-3 1.5096 1.5096 1.5096 ZT4-7 1.320143 1.320143 1.320143 ZT8-11 1.33176 1.33176 1.33176 ZT12-15 1.29987 1.29987 1.29987 ZT16-19 2.64909 2.64909 2.64909 ZT20-23 1.308805 1.308805 1.308805