condition mean min max ZT0-3 75.540718 75.540718 75.540718 ZT4-7 238.07155950000003 238.07155950000003 238.07155950000003 ZT8-11 168.349618 168.349618 168.349618 ZT12-15 354.111816 354.111816 354.111816 ZT16-19 280.6936505 280.6936505 280.6936505 ZT20-23 261.91961549999996 261.91961549999996 261.91961549999996