condition mean min max ZT0-3 4.312067828 0.761571759 7.862563897 ZT4-7 0.1649385995 0.14025839 0.189618809 ZT8-11 1.61037541975 0.843913037 2.3768378025 ZT12-15 4.24503198825 3.8502198419999996 4.6398441345000005 ZT16-19 1.5148815805 1.085604877 1.944158284 ZT20-23 0.90569515125 0.8264049745000001 0.984985328