condition mean min max ZT0-3 181.574719 181.574719 181.574719 ZT4-7 212.56093049999998 212.56093049999998 212.56093049999998 ZT8-11 231.763121 231.763121 231.763121 ZT12-15 266.339391 266.339391 266.339391 ZT16-19 243.62127049999998 243.62127049999998 243.62127049999998 ZT20-23 183.909316 183.909316 183.909316