condition mean min max ZT0-3 3.1094150000000003 1.7154150000000001 4.503415 ZT4-7 0.58228 0.58228 0.58228 ZT8-11 1.728805 1.728805 1.728805 ZT12-15 0 0 0 ZT16-19 1.688185 1.688185 1.688185 ZT20-23 2.26077 2.26077 2.26077