And if you look to the bottom of the chart, you will find 2 DA/MDA's (one higher than the other) or possibly two or more different visibility requirements.
In the example I have in front of me, the higher MDA must be used if you only have forecast terminal QNH. If using actual aerodrome QNH, the lower (conditional) MDA may be used.
QNH source is the example I have used but it could refer to runway lighting availability, and so on.