condition mean min max ZT0-3 110.849206 110.849206 110.849206 ZT4-7 159.255341 159.255341 159.255341 ZT8-11 157.6833075 157.6833075 157.6833075 ZT12-15 122.49125799999999 122.49125799999999 122.49125799999999 ZT16-19 121.8606905 121.8606905 121.8606905 ZT20-23 102.1676065 102.1676065 102.1676065