condition mean min max ZT0-3 35.1 35.1 35.1 ZT4-7 5.1 5.1 5.1 ZT8-11 21.25 21.25 21.25 ZT12-15 7.0 7.0 7.0 ZT16-19 19.65 19.65 19.65 ZT20-23 58.2 58.2 58.2