condition mean min max ZT0-3 10.45 10.45 10.45 ZT4-7 12.6 12.6 12.6 ZT8-11 13.7 13.7 13.7 ZT12-15 7.65 7.65 7.65 ZT16-19 14.5 14.5 14.5 ZT20-23 35.4 35.4 35.4