condition mean min max ZT0-3 212.727042 212.727042 212.727042 ZT4-7 72.523494 72.523494 72.523494 ZT8-11 134.0217315 134.0217315 134.0217315 ZT12-15 144.477098 144.477098 144.477098 ZT16-19 304.5475165 304.5475165 304.5475165 ZT20-23 298.81289549999997 298.81289549999997 298.81289549999997