condition mean min max ZT0-3 233.155134 233.155134 233.155134 ZT4-7 260.442463 260.442463 260.442463 ZT8-11 292.62896 292.62896 292.62896 ZT12-15 297.0778135 297.0778135 297.0778135 ZT16-19 196.80539850000002 196.80539850000002 196.80539850000002 ZT20-23 157.4846215 157.4846215 157.4846215