condition mean min max ZT0-3 20.129414 20.129414 20.129414 ZT4-7 11.254237499999999 11.254237499999999 11.254237499999999 ZT8-11 10.731322 10.731322 10.731322 ZT12-15 11.1148645 11.1148645 11.1148645 ZT16-19 9.1358785 9.1358785 9.1358785 ZT20-23 10.39352 10.39352 10.39352