condition mean min max ZT0-3 1616.751549 1616.751549 1616.751549 ZT4-7 650.014182 650.014182 650.014182 ZT8-11 293.035282 293.035282 293.035282 ZT12-15 411.4893125 411.4893125 411.4893125 ZT16-19 1212.103717 1212.103717 1212.103717 ZT20-23 1612.855229 1612.855229 1612.855229