condition mean min max ZT0-3 4.6 4.6 4.6 ZT4-7 24.1 24.1 24.1 ZT8-11 13.25 13.25 13.25 ZT12-15 14.05 14.05 14.05 ZT16-19 13.3 13.3 13.3 ZT20-23 10.9 10.9 10.9