condition mean min max ZT0-3 12.948875000000001 12.401900000000001 13.49585 ZT4-7 3.810865 3.810865 3.810865 ZT8-11 3.54232 3.54232 3.54232 ZT12-15 0 0 0 ZT16-19 5.8447949999999995 5.8447949999999995 5.8447949999999995 ZT20-23 10.9702 10.9702 10.9702