condition mean min max ZT0-3 9.3808875 8.90918 9.852595 ZT4-7 8.37568 8.37568 8.37568 ZT8-11 7.20224 7.20224 7.20224 ZT12-15 0 0 0 ZT16-19 9.418520000000001 9.418520000000001 9.418520000000001 ZT20-23 8.408584999999999 8.408584999999999 8.408584999999999