condition mean min max ZT0-3 30.45 30.45 30.45 ZT4-7 13.2 13.2 13.2 ZT8-11 23.15 23.15 23.15 ZT12-15 31.3 31.3 31.3 ZT16-19 24.05 24.05 24.05 ZT20-23 30.6 30.6 30.6