condition mean min max ZT0-3 913.55 913.55 913.55 ZT4-7 777.5 777.5 777.5 ZT8-11 964.9499999999999 964.9499999999999 964.9499999999999 ZT12-15 891.4000000000001 891.4000000000001 891.4000000000001 ZT16-19 1003.5 1003.5 1003.5 ZT20-23 928.85 928.85 928.85