condition mean min max ZT0-3 10.579435 8.553805 12.605065 ZT4-7 12.8812 12.8812 12.8812 ZT8-11 7.924529999999999 7.924529999999999 7.924529999999999 ZT12-15 0 0 0 ZT16-19 8.12332 8.12332 8.12332 ZT20-23 14.456949999999999 14.456949999999999 14.456949999999999