condition mean min max ZT0-3 220.89999999999998 220.89999999999998 220.89999999999998 ZT4-7 60.6 60.6 60.6 ZT8-11 281.6 281.6 281.6 ZT12-15 1277.8 1277.8 1277.8 ZT16-19 1466.7 1466.7 1466.7 ZT20-23 610.45 610.45 610.45