condition mean min max ZT0-3 16.0 16.0 16.0 ZT4-7 2.6 2.6 2.6 ZT8-11 8.45 8.45 8.45 ZT12-15 5.2 5.2 5.2 ZT16-19 15.299999999999999 15.299999999999999 15.299999999999999 ZT20-23 6.949999999999999 6.949999999999999 6.949999999999999