condition mean min max ZT0-3 21.05 21.05 21.05 ZT4-7 24.2 24.2 24.2 ZT8-11 16.75 16.75 16.75 ZT12-15 12.2 12.2 12.2 ZT16-19 19.1 19.1 19.1 ZT20-23 20.45 20.45 20.45