condition mean min max ZT0-3 0.286740775 0.14233805 0.4311435 ZT4-7 0.1415545 0.1415545 0.1415545 ZT8-11 0.04734755 0.04734755 0.04734755 ZT12-15 0 0 0 ZT16-19 0.329943 0.329943 0.329943 ZT20-23 0.52125 0.52125 0.52125