condition mean min max ZT0-3 509.0 509.0 509.0 ZT4-7 537.1 537.1 537.1 ZT8-11 467.75 467.75 467.75 ZT12-15 554.15 554.15 554.15 ZT16-19 487.29999999999995 487.29999999999995 487.29999999999995 ZT20-23 572.95 572.95 572.95