condition mean min max ZT0-3 11.75 11.75 11.75 ZT4-7 44.2 44.2 44.2 ZT8-11 23.4 23.4 23.4 ZT12-15 25.75 25.75 25.75 ZT16-19 23.05 23.05 23.05 ZT20-23 26.950000000000003 26.950000000000003 26.950000000000003