condition mean min max ZT0-3 46.42179987 41.8916809 50.95191884 ZT4-7 27.109464957500002 26.054652675 28.16427724 ZT8-11 38.4395205175 32.489486684999996 44.38955435 ZT12-15 42.8469258775 39.677927935 46.01592382 ZT16-19 39.7899065925 37.39194395 42.187869235 ZT20-23 39.968915842499996 38.42935467 41.508477015