condition mean min max ZT0-3 10.363388 10.363388 10.363388 ZT4-7 10.7916805 10.7916805 10.7916805 ZT8-11 9.4442385 9.4442385 9.4442385 ZT12-15 10.7235805 10.7235805 10.7235805 ZT16-19 10.430856 10.430856 10.430856 ZT20-23 13.2623675 13.2623675 13.2623675