condition mean min max ZT0-3 3.5116 2.667 4.3562 ZT4-7 3.89844 3.89844 3.89844 ZT8-11 2.146635 2.146635 2.146635 ZT12-15 0 0 0 ZT16-19 5.585285 5.585285 5.585285 ZT20-23 5.80755 5.80755 5.80755