condition mean min max ZT0-3 9.600000000000001 9.600000000000001 9.600000000000001 ZT4-7 14.9 14.9 14.9 ZT8-11 6.300000000000001 6.300000000000001 6.300000000000001 ZT12-15 10.95 10.95 10.95 ZT16-19 21.95 21.95 21.95 ZT20-23 16.35 16.35 16.35