condition mean min max ZT0-3 477.787636 477.787636 477.787636 ZT4-7 587.0186685 587.0186685 587.0186685 ZT8-11 771.3344175 771.3344175 771.3344175 ZT12-15 613.5168825000001 613.5168825000001 613.5168825000001 ZT16-19 683.039749 683.039749 683.039749 ZT20-23 557.8909894999999 557.8909894999999 557.8909894999999