condition mean min max ZT0-3 3.81409551675 2.492335265 5.1358557685 ZT4-7 7.39257953025 6.997981648 7.7871774125 ZT8-11 6.79182456975 6.4470786355000005 7.136570504 ZT12-15 5.8956704669999995 4.9173745035 6.8739664304999994 ZT16-19 6.56142035175 6.3936522205 6.729188483 ZT20-23 6.9639262335000005 6.815188052 7.112664415