condition mean min max ZT0-3 28.200000000000003 28.200000000000003 28.200000000000003 ZT4-7 17.6 17.6 17.6 ZT8-11 9.2 9.2 9.2 ZT12-15 4.45 4.45 4.45 ZT16-19 7.95 7.95 7.95 ZT20-23 25.0 25.0 25.0