condition mean min max ZT0-3 237.275712225 221.92987165 252.6215528 ZT4-7 179.749081575 167.0793948 192.41876835000002 ZT8-11 287.10799340000005 222.50280945000003 351.71317735 ZT12-15 169.635819865 93.48796347999999 245.78367625 ZT16-19 74.5702211375 63.83010962 85.310332655 ZT20-23 55.810114115 54.809937579999996 56.81029065