condition mean min max ZT0-3 45.8 45.8 45.8 ZT4-7 15.4 15.4 15.4 ZT8-11 38.7 38.7 38.7 ZT12-15 14.25 14.25 14.25 ZT16-19 17.3 17.3 17.3 ZT20-23 53.7 53.7 53.7