condition mean min max ZT0-3 857.9000000000001 857.9000000000001 857.9000000000001 ZT4-7 1815.8 1815.8 1815.8 ZT8-11 1716.95 1716.95 1716.95 ZT12-15 1399.7 1399.7 1399.7 ZT16-19 999.25 999.25 999.25 ZT20-23 873.3499999999999 873.3499999999999 873.3499999999999