condition mean min max ZT0-3 5.58048 5.58048 5.58048 ZT4-7 5.692855 5.692855 5.692855 ZT8-11 3.96466 3.96466 3.96466 ZT12-15 2.983205 2.983205 2.983205 ZT16-19 4.454435 4.454435 4.454435 ZT20-23 5.174625000000001 5.174625000000001 5.174625000000001