condition mean min max ZT0-3 19.4 19.4 19.4 ZT4-7 10.2 10.2 10.2 ZT8-11 23.950000000000003 23.950000000000003 23.950000000000003 ZT12-15 40.4 40.4 40.4 ZT16-19 17.85 17.85 17.85 ZT20-23 31.65 31.65 31.65