condition mean min max ZT0-3 11.098589 11.098589 11.098589 ZT4-7 9.469380999999998 9.469380999999998 9.469380999999998 ZT8-11 8.8069665 8.8069665 8.8069665 ZT12-15 8.660827999999999 8.660827999999999 8.660827999999999 ZT16-19 10.632654500000001 10.632654500000001 10.632654500000001 ZT20-23 9.308542 9.308542 9.308542