condition mean min max ZT0-3 1.05562990575 0.5858121665 1.525447645 ZT4-7 0.675966555 0.5462474895 0.8056856204999999 ZT8-11 2.1325103895 1.5667229040000001 2.698297875 ZT12-15 3.638449442 3.3402056575000003 3.9366932265 ZT16-19 4.080453856749999 3.4033698334999998 4.757537879999999 ZT20-23 6.958640100999999 5.72226188 8.195018322