condition mean min max ZT0-3 7.15 7.15 7.15 ZT4-7 6.2 6.2 6.2 ZT8-11 50.65 50.65 50.65 ZT12-15 5.45 5.45 5.45 ZT16-19 56.55 56.55 56.55 ZT20-23 58.75 58.75 58.75