condition mean min max ZT0-3 5.485485000000001 5.485485000000001 5.485485000000001 ZT4-7 4.02478 4.02478 4.02478 ZT8-11 2.84948 2.84948 2.84948 ZT12-15 3.522985 3.522985 3.522985 ZT16-19 9.15371 9.15371 9.15371 ZT20-23 6.43656 6.43656 6.43656