condition mean min max ZT0-3 219.065489 219.065489 219.065489 ZT4-7 146.0875775 146.0875775 146.0875775 ZT8-11 164.96657299999998 164.96657299999998 164.96657299999998 ZT12-15 158.7786755 158.7786755 158.7786755 ZT16-19 218.7939505 218.7939505 218.7939505 ZT20-23 229.10722599999997 229.10722599999997 229.10722599999997