condition mean min max ZT0-3 16.65 16.65 16.65 ZT4-7 12.6 12.6 12.6 ZT8-11 46.199999999999996 46.199999999999996 46.199999999999996 ZT12-15 24.7 24.7 24.7 ZT16-19 67.05000000000001 67.05000000000001 67.05000000000001 ZT20-23 31.8 31.8 31.8