condition mean min max ZT0-3 1.84217541425 1.8106855945 1.873665234 ZT4-7 1.4188383975 1.0913643275 1.7463124675000001 ZT8-11 1.30116647375 1.190675218 1.4116577295 ZT12-15 1.877307071 1.122039981 2.632574161 ZT16-19 1.8571701545 1.77094375 1.943396559 ZT20-23 3.51100934625 3.4775759634999996 3.544442729