condition mean min max ZT0-3 24.96835 22.825200000000002 27.1115 ZT4-7 13.09615 13.09615 13.09615 ZT8-11 16.01815 16.01815 16.01815 ZT12-15 0 0 0 ZT16-19 21.105449999999998 21.105449999999998 21.105449999999998 ZT20-23 22.1423 22.1423 22.1423