condition mean min max ZT0-3 11.600000000000001 11.600000000000001 11.600000000000001 ZT4-7 6.7 6.7 6.7 ZT8-11 8.5 8.5 8.5 ZT12-15 2.85 2.85 2.85 ZT16-19 10.45 10.45 10.45 ZT20-23 21.950000000000003 21.950000000000003 21.950000000000003