condition mean min max ZT0-3 26.65 26.65 26.65 ZT4-7 16.6 16.6 16.6 ZT8-11 17.75 17.75 17.75 ZT12-15 17.55 17.55 17.55 ZT16-19 8.7 8.7 8.7 ZT20-23 9.6 9.6 9.6