condition mean min max ZT0-3 39.65 39.65 39.65 ZT4-7 39.0 39.0 39.0 ZT8-11 29.85 29.85 29.85 ZT12-15 67.2 67.2 67.2 ZT16-19 6.45 6.45 6.45 ZT20-23 56.3 56.3 56.3