condition mean min max ZT0-3 5.475045 5.14972 5.80037 ZT4-7 7.3495800000000004 7.3495800000000004 7.3495800000000004 ZT8-11 14.09995 14.09995 14.09995 ZT12-15 0 0 0 ZT16-19 7.77421 7.77421 7.77421 ZT20-23 8.137145 8.137145 8.137145