condition mean min max ZT0-3 31.1 31.1 31.1 ZT4-7 4.9 4.9 4.9 ZT8-11 41.3 41.3 41.3 ZT12-15 12.049999999999999 12.049999999999999 12.049999999999999 ZT16-19 6.15 6.15 6.15 ZT20-23 41.8 41.8 41.8