condition mean min max ZT0-3 225.702463 225.702463 225.702463 ZT4-7 266.4407755 266.4407755 266.4407755 ZT8-11 237.3802925 237.3802925 237.3802925 ZT12-15 231.2747185 231.2747185 231.2747185 ZT16-19 206.9593865 206.9593865 206.9593865 ZT20-23 212.7376885 212.7376885 212.7376885