condition mean min max ZT0-3 554.923 479.7025 648.1225 ZT4-7 619.9549999999999 619.9549999999999 619.9549999999999 ZT8-11 539.5754999999999 539.5754999999999 539.5754999999999 ZT12-15 562.968 544.5245 581.4114999999999 ZT16-19 654.7840000000001 654.7840000000001 654.7840000000001 ZT20-23 526.3355 526.3355 526.3355