condition mean min max ZT0-3 39.95 39.95 39.95 ZT4-7 29.2 29.2 29.2 ZT8-11 69.3 69.3 69.3 ZT12-15 56.6 56.6 56.6 ZT16-19 68.4 68.4 68.4 ZT20-23 30.25 30.25 30.25