condition mean min max ZT0-3 17.05 17.05 17.05 ZT4-7 1.2 1.2 1.2 ZT8-11 8.55 8.55 8.55 ZT12-15 15.600000000000001 15.600000000000001 15.600000000000001 ZT16-19 10.75 10.75 10.75 ZT20-23 22.450000000000003 22.450000000000003 22.450000000000003