condition mean min max ZT0-3 5.15 5.15 5.15 ZT4-7 21.7 21.7 21.7 ZT8-11 13.3 13.3 13.3 ZT12-15 15.0 15.0 15.0 ZT16-19 17.45 17.45 17.45 ZT20-23 10.5 10.5 10.5