condition mean min max ZT0-3 208.385903 208.385903 208.385903 ZT4-7 218.9908305 218.9908305 218.9908305 ZT8-11 220.4610085 220.4610085 220.4610085 ZT12-15 195.666967 195.666967 195.666967 ZT16-19 289.1849195 289.1849195 289.1849195 ZT20-23 371.7844145 371.7844145 371.7844145