condition mean min max ZT0-3 19.25 19.25 19.25 ZT4-7 5.1 5.1 5.1 ZT8-11 5.6 5.6 5.6 ZT12-15 10.25 10.25 10.25 ZT16-19 22.1 22.1 22.1 ZT20-23 13.15 13.15 13.15