condition mean min max ZT0-3 13.301756 13.301756 13.301756 ZT4-7 9.6266225 9.6266225 9.6266225 ZT8-11 15.189452499999998 15.189452499999998 15.189452499999998 ZT12-15 12.2323115 12.2323115 12.2323115 ZT16-19 9.910961 9.910961 9.910961 ZT20-23 11.4644205 11.4644205 11.4644205