condition mean min max ZT0-3 4.1379125000000005 3.784235 4.49159 ZT4-7 3.1742850000000002 3.1742850000000002 3.1742850000000002 ZT8-11 1.2090745 1.2090745 1.2090745 ZT12-15 0 0 0 ZT16-19 2.91995 2.91995 2.91995 ZT20-23 4.505575 4.505575 4.505575