condition mean min max ZT0-3 11.4 11.4 11.4 ZT4-7 53.9 53.9 53.9 ZT8-11 20.95 20.95 20.95 ZT12-15 25.85 25.85 25.85 ZT16-19 19.3 19.3 19.3 ZT20-23 32.4 32.4 32.4