condition mean min max ZT0-3 24.25 24.25 24.25 ZT4-7 4.6 4.6 4.6 ZT8-11 7.85 7.85 7.85 ZT12-15 13.6 13.6 13.6 ZT16-19 10.75 10.75 10.75 ZT20-23 18.1 18.1 18.1