condition mean min max ZT0-3 113.425878 113.425878 113.425878 ZT4-7 144.088586 144.088586 144.088586 ZT8-11 133.153433 133.153433 133.153433 ZT12-15 115.0901605 115.0901605 115.0901605 ZT16-19 153.04479800000001 153.04479800000001 153.04479800000001 ZT20-23 176.4332195 176.4332195 176.4332195