condition mean min max ZT0-3 11.2526975 10.784144999999999 11.721250000000001 ZT4-7 4.699714999999999 4.699714999999999 4.699714999999999 ZT8-11 17.043300000000002 17.043300000000002 17.043300000000002 ZT12-15 0 0 0 ZT16-19 16.7425 16.7425 16.7425 ZT20-23 12.057649999999999 12.057649999999999 12.057649999999999