condition mean min max ZT0-3 13.65 13.65 13.65 ZT4-7 14.3 14.3 14.3 ZT8-11 15.049999999999999 15.049999999999999 15.049999999999999 ZT12-15 10.05 10.05 10.05 ZT16-19 10.05 10.05 10.05 ZT20-23 21.65 21.65 21.65