condition mean min max ZT0-3 2.5131075 1.839415 3.1868 ZT4-7 1.9246150000000002 1.9246150000000002 1.9246150000000002 ZT8-11 4.244915 4.244915 4.244915 ZT12-15 0 0 0 ZT16-19 4.598135 4.598135 4.598135 ZT20-23 2.844735 2.844735 2.844735