Yale-Brown Obsessive Compulsive Scale (Y-BOCS)

OBSESSIONS: are thoughts, ideas or images that keep coming into your [your child] mind, or that you [they] cannot stop thinking about even though you [s/he] does not want them to.

COMPULSIONS: are behaviours or habits that you [your child] cannot stop doing or feels they have to do although you [s/he] knows that they do not make sense or are excessive.

INSTRUCTIONS: Answer each question based on the average occurrence of each item over the past week. The first 5 questions relate to obsessive thoughts, the last 5 questions relate to compulsive behaviours.

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1.Time occupied by obsessive thoughts: How much time do you [does the child] spend thinking about these things in a day? *

None

Less than 1 hour a day

Between 1 to 3 hours a day

Between 3 to 8 hours a day

More than 8 hours a day

2.Interference due to obsessive thoughts: How much do these thoughts get in the way of school or doing things with your [his/her] friends? *

They don’t get in the way – None

They get in the way a little – Mild

They get in the way sometimes – Moderate

They get in the way a lot – Severe

They keep me [him/her] from doing everything – Extreme

3.Distress associated with obsessive thoughts: How much do these thoughts bother or upset you [the child]? *

Not at all – None

A little – Mild

Some – Moderate

A lot – Severe

So much that it is hard to do anything – Extreme

4.Resistance against obsessions: How hard do you [does the child] try to stop the thoughts or ignore them? *

Always try [tries] to resist the thoughts

Try [tries] to resist the thoughts most of the time

Try [tries] to resist the thoughts some times

Usually don’t try [doesn’t try] to resist the thoughts, but want[s] to

Don’t try [does not try] to resist the thoughts

5.Degree of control over obsessive thoughts: When you try [the child tries] to fight the thoughts, they can be beat? *

Always can beat or stop them – Complete control

Can usually beat or stop them – Much control

Can sometimes beat or stop them – Moderate control

Not beat or stopped very often – Little control

Never beats or stops them – No control

6.Time occupied by compulsive behaviours: How much time do you [does the child] spend doing these things in a day? *

None

Less than 1 hour a day

Between 1 to 3 hours a day

Between 3 to 8 hours a day

More than 8 hours a day

7.Interference due to compulsive behaviours: How much do these habits get in the way of school or doing things with your [his or her] friends? *

They don’t get in the way – None

They get in the way a little – Mild

They get in the way sometimes – Moderate

They get in the way a lot – Severe

They keep me [him/her] from doing everything – Extreme

8.Distress associated with compulsive behaviours: How upset would you [the child] feel if you [s/he] could not do the habits? *

Not at all – None

A little – Mild

Some – Moderate

A lot – Severe

So much that it is hard to do anything – Extreme

9.Resistance against compulsions: How hard do you [does the child] try to stop or fight the habits? *

Always try [tries] to resist the habits

Try [tries] to resist the habits most of the time

Try [tries] to resist the habits some times

Usually don’t try [doesn’t try] to resist the habits, but want[s] to

Don’t try [does not try] to resist the habits

10.Degree of control over compulsions: When you try [the child tries] to fight the habits, they can be beat? *

Always can beat or stop them – Complete control

Can usually beat or stop them – Much control

Can sometimes beat or stop them – Moderate control

Not beat or stopped very often – Little control

Never beats or stops them – No control