condition mean min max ZT0-3 12.15 12.15 12.15 ZT4-7 31.5 31.5 31.5 ZT8-11 30.6 30.6 30.6 ZT12-15 21.85 21.85 21.85 ZT16-19 47.15 47.15 47.15 ZT20-23 15.700000000000001 15.700000000000001 15.700000000000001