condition mean min max ZT0-3 42.2 42.2 42.2 ZT4-7 52.7 52.7 52.7 ZT8-11 24.2 24.2 24.2 ZT12-15 20.9 20.9 20.9 ZT16-19 24.2 24.2 24.2 ZT20-23 13.55 13.55 13.55