condition mean min max ZT0-3 37.65 37.65 37.65 ZT4-7 21.0 21.0 21.0 ZT8-11 11.6 11.6 11.6 ZT12-15 12.25 12.25 12.25 ZT16-19 53.15 53.15 53.15 ZT20-23 40.95 40.95 40.95