condition mean min max ZT0-3 11.4 11.4 11.4 ZT4-7 83.9 83.9 83.9 ZT8-11 31.65 31.65 31.65 ZT12-15 30.3 30.3 30.3 ZT16-19 15.4 15.4 15.4 ZT20-23 35.05 35.05 35.05