condition mean min max ZT0-3 17.034750000000003 17.034750000000003 17.034750000000003 ZT4-7 9.932739999999999 9.932739999999999 9.932739999999999 ZT8-11 8.57606 8.57606 8.57606 ZT12-15 8.73679 8.73679 8.73679 ZT16-19 18.91395 18.91395 18.91395 ZT20-23 17.6754 17.6754 17.6754