condition mean min max ZT0-3 0.75724081325 0.337540822 1.1769408045 ZT4-7 2.51698950375 2.083142269 2.9508367385 ZT8-11 3.67993487675 3.1842197245 4.175650029 ZT12-15 3.52993684375 3.1044180505 3.955455637 ZT16-19 2.0540214910000003 1.9490132205 2.1590297615000003 ZT20-23 4.23276252725 3.2716147235 5.1939103310000005