condition mean min max ZT0-3 0.3412085 0.3412085 0.3412085 ZT4-7 0.147819 0.147819 0.147819 ZT8-11 0.2618715 0.2618715 0.2618715 ZT12-15 0.073705 0.073705 0.073705 ZT16-19 0.065353 0.065353 0.065353 ZT20-23 0.353413 0.353413 0.353413