condition mean min max ZT0-3 2249.013909 2249.013909 2249.013909 ZT4-7 609.984305 609.984305 609.984305 ZT8-11 664.22518 664.22518 664.22518 ZT12-15 1344.703776 1344.703776 1344.703776 ZT16-19 3228.5987595 3228.5987595 3228.5987595 ZT20-23 3811.8675869999997 3811.8675869999997 3811.8675869999997