condition mean min max ZT0-3 15.5278098175 14.828120140000001 16.227499495 ZT4-7 8.5365466775 7.769754951 9.303338404 ZT8-11 9.369345646166666 8.915636899333332 9.823054393 ZT12-15 11.444921639333334 11.074672088666667 11.81517119 ZT16-19 10.1842924125 10.087908952 10.280675873 ZT20-23 10.464922364500001 9.674749244666668 11.255095484333333