condition mean min max ZT0-3 53.893815 53.893815 53.893815 ZT4-7 51.0893935 51.0893935 51.0893935 ZT8-11 76.94040749999999 76.94040749999999 76.94040749999999 ZT12-15 66.3687045 66.3687045 66.3687045 ZT16-19 137.8856135 137.8856135 137.8856135 ZT20-23 117.8328315 117.8328315 117.8328315