condition mean min max ZT0-3 20.3989920575 19.22529161 21.572692505 ZT4-7 17.756001562500003 16.100415955000003 19.41158717 ZT8-11 26.445396965 22.823455685 30.067338245 ZT12-15 21.381417589999998 21.245355645 21.517479535 ZT16-19 15.312793865000002 15.147229970000001 15.478357760000002 ZT20-23 14.404658662500001 14.32742062 14.481896705