condition mean min max ZT0-3 35.6 35.6 35.6 ZT4-7 25.2 25.2 25.2 ZT8-11 25.2 25.2 25.2 ZT12-15 26.950000000000003 26.950000000000003 26.950000000000003 ZT16-19 10.5 10.5 10.5 ZT20-23 11.3 11.3 11.3