You can test the same person 'before' and 'after' a particular treatment, then look at the difference.

Are you interested in trying a particular treatment first?

But it's a serious and particular treatment of the play as well.

Study provides evidence that a particular treatment is helpful for a condition.

He explained to me why he thought we should try a particular treatment.

Numerous medical remedies exist but no particular treatment is known to be especially effective.

How do we know whether a particular treatment really works?

How much experience does the doctor have with the particular treatment?

And we have some really good evidence supporting particular treatments that appear to be very effective.

Patients' also have the right to decide whether or not they wish to consent to a particular treatment.