condition mean min max ZT0-3 0.85353 0.85353 0.85353 ZT4-7 2.375845 2.375845 2.375845 ZT8-11 1.28901 1.28901 1.28901 ZT12-15 5.469305 5.469305 5.469305 ZT16-19 1.02741 1.02741 1.02741 ZT20-23 2.050385 2.050385 2.050385