condition mean min max ZT0-3 238.3 238.3 238.3 ZT4-7 228.5 228.5 228.5 ZT8-11 205.5 205.5 205.5 ZT12-15 202.55 202.55 202.55 ZT16-19 169.8 169.8 169.8 ZT20-23 200.05 200.05 200.05