condition mean min max ZT0-3 44.1 44.1 44.1 ZT4-7 12.4 12.4 12.4 ZT8-11 6.6000000000000005 6.6000000000000005 6.6000000000000005 ZT12-15 20.4 20.4 20.4 ZT16-19 16.95 16.95 16.95 ZT20-23 34.35 34.35 34.35