condition mean min max ZT0-3 3.2123505984999996 2.8052697699999998 3.619431427 ZT4-7 2.96344199925 1.951805406 3.9750785925 ZT8-11 9.2388450105 6.900800347000001 11.576889674 ZT12-15 9.182783757 9.0350650205 9.3305024935 ZT16-19 3.49384865525 3.3013630425 3.6863342680000004 ZT20-23 1.9348987599999998 1.5457451235 2.3240523965