ZBI-12: Zarit Burden Interview short form

What this assessment is

The ZBI-12 is a 12-item short form of the Zarit Burden Interview.

It measures the personal impact of an unpaid caregiving role. The result ranges from 0 to 48, with higher scores indicating greater perceived burden.

Michel Bedard and colleagues developed this short form from the 22-item ZBI in 2001.

ZBI-12 is not a diagnosis. It does not rate the quality of care a person provides.

Form matters.

Who it was designed for

The original short-form study involved 413 caregivers of older adults with cognitive impairment who had been referred to a memory clinic.

Later research has used ZBI-12 with people caring for relatives with other health conditions. A version should be validated for the caregiving population, language, and setting in which it is used.

This page covers the 12-item form developed by Bedard and colleagues. It does not cover the original ZBI-22 or other short forms.

Cutoffs and score ranges from the ZBI-22 cannot be transferred to ZBI-12.

Keep the forms separate.

How it is administered

The caregiver rates 12 statements using five response levels scored from 0 to 4.

The form usually takes about five minutes. It can be self-administered or used in a structured assessment.

The original form does not define one fixed recent recall period. Instructions and response coding should therefore be recorded with the result.

All 12 responses are needed for the standard total. No general missing-response rule was established in the original short-form paper.

Use complete data.

What it measures

ZBI-12 covers the caregiver's sense of strain, loss of control, conflict between caregiving and personal life, and effects on social or emotional wellbeing.

These experiences are combined into one burden total. The standard short form does not produce separate domain scores.

Burden is subjective. Two people providing similar amounts of care can report different effects because their health, support, finances, relationship, and other responsibilities differ.

The Family APGAR measures satisfaction with family functioning. The MSPSS measures perceived support from several sources. Neither is a substitute for a caregiver-burden measure.

How scoring works

Score each response from 0 to 4, then add all 12 values.

The total ranges from 0 to 48. Higher totals indicate greater perceived caregiver burden.

There are no standard subscale scores and no reverse-scored questions in this 12-item form.

Do not convert a ZBI-12 total into a ZBI-22 total. Do not calculate a standard result from an incomplete form unless the selected protocol validates a missing-response method.

How to interpret a ZBI-12 score

Treat the total as a continuous measure unless the selected setting has validated a decision point.

Context comes first.

Ranges of 0 to 10, 11 to 20, and 21 to 48 appear in some reports. They are sometimes labeled no-to-mild, mild-to-moderate, and high burden.

Those labels are not universal. A study of short ZBI cutoffs found that widely used boundaries often lacked a clear empirical basis.

If categories are used, state the source, caregiving population, and purpose. Do not treat a one-point difference across a boundary as a clinical change by itself.

Repeated scores can support a conversation about changing strain when administration stays consistent.

Burden can change.

What the score cannot tell you

ZBI-12 cannot show why caregiving feels difficult or which support would help.

Do not infer cause.

It cannot determine whether care is safe, adequate, or willingly provided. It does not assess the care recipient's needs in detail.

A low score does not prove that a caregiver has enough support. A high score does not mean that the caregiver resents the person receiving care.

Support still matters.

The total also cannot diagnose depression, anxiety, burnout, or a family problem. Those questions need separate assessment.

Evidence and limitations

The original study found that the 12-item form retained much of the information in the longer ZBI while reducing completion time.

An independent validation study supported the 0-to-48 total in caregivers of people with advanced illness, but its proposed cutoff came from that specific population and purpose.

The short form is efficient, but it cannot describe every practical, relational, and health effect of caregiving.

Important detail gets lost.

Record the exact ZBI form, language, caregiving population, response coding, and any cutoff used.