condition mean min max ZT0-3 1.0529951666666668 0.8469055000000001 1.2848950000000001 ZT4-7 0.7091665 0.7091665 0.7091665 ZT8-11 0.698929 0.698929 0.698929 ZT12-15 1.09413325 0.9939665 1.1943000000000001 ZT16-19 1.0603574999999998 1.0603574999999998 1.0603574999999998 ZT20-23 1.105975 1.105975 1.105975