condition mean min max ZT0-3 19.05 19.05 19.05 ZT4-7 5.9 5.9 5.9 ZT8-11 3.5999999999999996 3.5999999999999996 3.5999999999999996 ZT12-15 18.0 18.0 18.0 ZT16-19 11.1 11.1 11.1 ZT20-23 16.5 16.5 16.5