condition mean min max ZT0-3 5.239625 4.37808 6.10117 ZT4-7 4.46601 4.46601 4.46601 ZT8-11 3.1342 3.1342 3.1342 ZT12-15 0 0 0 ZT16-19 8.863185000000001 8.863185000000001 8.863185000000001 ZT20-23 10.40086 10.40086 10.40086