condition mean min max ZT0-3 86.80000000000001 86.80000000000001 86.80000000000001 ZT4-7 115.3 115.3 115.3 ZT8-11 108.85 108.85 108.85 ZT12-15 119.15 119.15 119.15 ZT16-19 75.55 75.55 75.55 ZT20-23 87.3 87.3 87.3