condition mean min max ZT0-3 2838.3500000000004 2838.3500000000004 2838.3500000000004 ZT4-7 1793.4 1793.4 1793.4 ZT8-11 1627.8000000000002 1627.8000000000002 1627.8000000000002 ZT12-15 1688.45 1688.45 1688.45 ZT16-19 2359.45 2359.45 2359.45 ZT20-23 2690.75 2690.75 2690.75