condition mean min max ZT0-3 20.3 20.3 20.3 ZT4-7 2.1 2.1 2.1 ZT8-11 12.45 12.45 12.45 ZT12-15 12.600000000000001 12.600000000000001 12.600000000000001 ZT16-19 2.05 2.05 2.05 ZT20-23 24.200000000000003 24.200000000000003 24.200000000000003