condition mean min max ZT0-3 18.950000000000003 18.950000000000003 18.950000000000003 ZT4-7 32.9 32.9 32.9 ZT8-11 29.150000000000002 29.150000000000002 29.150000000000002 ZT12-15 12.85 12.85 12.85 ZT16-19 25.75 25.75 25.75 ZT20-23 9.850000000000001 9.850000000000001 9.850000000000001