condition mean min max ZT0-3 169.55 169.55 169.55 ZT4-7 152.8 152.8 152.8 ZT8-11 160.5 160.5 160.5 ZT12-15 241.25 241.25 241.25 ZT16-19 264.0 264.0 264.0 ZT20-23 228.3 228.3 228.3