condition mean min max ZT0-3 30.15 30.15 30.15 ZT4-7 20.6 20.6 20.6 ZT8-11 14.799999999999999 14.799999999999999 14.799999999999999 ZT12-15 13.0 13.0 13.0 ZT16-19 11.9 11.9 11.9 ZT20-23 35.45 35.45 35.45