condition mean min max ZT0-3 18.841833 18.841833 18.841833 ZT4-7 22.3472555 22.3472555 22.3472555 ZT8-11 26.086419499999998 26.086419499999998 26.086419499999998 ZT12-15 25.546951 25.546951 25.546951 ZT16-19 22.712346 22.712346 22.712346 ZT20-23 24.9803085 24.9803085 24.9803085