condition mean min max ZT0-3 30.700000000000003 30.700000000000003 30.700000000000003 ZT4-7 19.8 19.8 19.8 ZT8-11 45.3 45.3 45.3 ZT12-15 47.8 47.8 47.8 ZT16-19 32.1 32.1 32.1 ZT20-23 18.5 18.5 18.5