condition mean min max ZT0-3 1.78738 1.78738 1.78738 ZT4-7 0.9979525 0.9979525 0.9979525 ZT8-11 1.62094 1.62094 1.62094 ZT12-15 1.605595 1.605595 1.605595 ZT16-19 3.4504400000000004 3.4504400000000004 3.4504400000000004 ZT20-23 2.096615 2.096615 2.096615