condition mean min max ZT0-3 202.949877 202.949877 202.949877 ZT4-7 178.1964845 178.1964845 178.1964845 ZT8-11 213.86637100000002 213.86637100000002 213.86637100000002 ZT12-15 150.7582765 150.7582765 150.7582765 ZT16-19 250.16364099999998 250.16364099999998 250.16364099999998 ZT20-23 236.1998775 236.1998775 236.1998775