condition mean min max ZT0-3 273.274653 273.274653 273.274653 ZT4-7 258.095414 258.095414 258.095414 ZT8-11 189.600735 189.600735 189.600735 ZT12-15 204.58211999999997 204.58211999999997 204.58211999999997 ZT16-19 117.0990785 117.0990785 117.0990785 ZT20-23 99.43938650000001 99.43938650000001 99.43938650000001