condition mean min max ZT0-3 1.972565 1.748715 2.196415 ZT4-7 3.650315 3.650315 3.650315 ZT8-11 1.1361935 1.1361935 1.1361935 ZT12-15 0 0 0 ZT16-19 4.08537 4.08537 4.08537 ZT20-23 5.660075 5.660075 5.660075