condition mean min max ZT0-3 6.100291666666666 5.705585 6.71139 ZT4-7 5.477180000000001 5.477180000000001 5.477180000000001 ZT8-11 5.38146 5.38146 5.38146 ZT12-15 5.68755 5.333505 6.041595 ZT16-19 5.610595 5.610595 5.610595 ZT20-23 7.476935 7.476935 7.476935