condition mean min max ZT0-3 342.871422 342.871422 342.871422 ZT4-7 511.34024 511.34024 511.34024 ZT8-11 452.67462950000004 452.67462950000004 452.67462950000004 ZT12-15 442.866929 442.866929 442.866929 ZT16-19 334.75060399999995 334.75060399999995 334.75060399999995 ZT20-23 260.9594335 260.9594335 260.9594335