condition mean min max ZT0-3 35.05 35.05 35.05 ZT4-7 15.8 15.8 15.8 ZT8-11 31.950000000000003 31.950000000000003 31.950000000000003 ZT12-15 14.6 14.6 14.6 ZT16-19 60.95 60.95 60.95 ZT20-23 31.450000000000003 31.450000000000003 31.450000000000003