condition mean min max ZT0-3 17.15 17.15 17.15 ZT4-7 10.2 10.2 10.2 ZT8-11 29.6 29.6 29.6 ZT12-15 38.45 38.45 38.45 ZT16-19 9.7 9.7 9.7 ZT20-23 15.9 15.9 15.9