condition mean min max ZT0-3 36.65 36.65 36.65 ZT4-7 20.7 20.7 20.7 ZT8-11 47.55 47.55 47.55 ZT12-15 20.4 20.4 20.4 ZT16-19 69.15 69.15 69.15 ZT20-23 52.3 52.3 52.3