condition mean min max ZT0-3 9.513345000000001 5.140115 12.6681 ZT4-7 7.887684999999999 7.887684999999999 7.887684999999999 ZT8-11 13.3566 13.3566 13.3566 ZT12-15 12.4803 12.368649999999999 12.59195 ZT16-19 12.853850000000001 12.853850000000001 12.853850000000001 ZT20-23 16.04675 16.04675 16.04675