condition mean min max ZT0-3 3.888605 3.840445 3.9367650000000003 ZT4-7 3.1507300000000003 3.1507300000000003 3.1507300000000003 ZT8-11 3.4154400000000003 3.4154400000000003 3.4154400000000003 ZT12-15 0 0 0 ZT16-19 4.98803 4.98803 4.98803 ZT20-23 4.65348 4.65348 4.65348