condition mean min max ZT0-3 9.966625 9.966625 9.966625 ZT4-7 5.793755 5.793755 5.793755 ZT8-11 7.60428 7.60428 7.60428 ZT12-15 10.173494999999999 10.173494999999999 10.173494999999999 ZT16-19 14.8981 14.8981 14.8981 ZT20-23 12.51135 12.51135 12.51135