condition mean min max ZT0-3 3.15 3.15 3.15 ZT4-7 2.4 2.4 2.4 ZT8-11 4.6 4.6 4.6 ZT12-15 3.25 3.25 3.25 ZT16-19 12.0 12.0 12.0 ZT20-23 4.949999999999999 4.949999999999999 4.949999999999999