condition mean min max ZT0-3 226.578211 226.578211 226.578211 ZT4-7 217.1720355 217.1720355 217.1720355 ZT8-11 202.699582 202.699582 202.699582 ZT12-15 203.18730449999998 203.18730449999998 203.18730449999998 ZT16-19 216.0346685 216.0346685 216.0346685 ZT20-23 253.59618749999998 253.59618749999998 253.59618749999998