condition mean min max ZT0-3 225.498158 225.498158 225.498158 ZT4-7 249.8497435 249.8497435 249.8497435 ZT8-11 217.94201650000002 217.94201650000002 217.94201650000002 ZT12-15 248.0021205 248.0021205 248.0021205 ZT16-19 191.066184 191.066184 191.066184 ZT20-23 200.2282975 200.2282975 200.2282975