condition mean min max ZT0-3 25.200000000000003 25.200000000000003 25.200000000000003 ZT4-7 3.7 3.7 3.7 ZT8-11 14.95 14.95 14.95 ZT12-15 14.2 14.2 14.2 ZT16-19 12.45 12.45 12.45 ZT20-23 20.05 20.05 20.05