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Table 1 Modified quality assessment of diagnostic accuracy studies tool: quality criteria for prevalence studies

From: The prevalence of freezing of gait in Parkinson’s disease and in patients with different disease durations and severities

Sorts

Subsorts

Quality criteria

A

 

The final sample should be representative of the target population

 

1

At least 1 of the following should apply for the study (2 points)

  

 – An entire target population

  

 – Randomly selected sample

  

 – Sample stated to represent the target population

 

2

At least one of the following (2 points)

  

 – Reasons for nonresponders described

  

 – Nonresponders described

  

 – Comparison of responders and nonresponders

  

 – Comparison of sample and target population

 

3

Response rate > 90% (2 points)

  

 Response rate 70% to 90% (1 point)

  

 Response rate ≤ 70% (0 points)

B

 

Quality of data

 

4

Were the data primary from a prevalence study (2 points) or was it taken from a survey not specifically designed for that purpose (1 point)?

 

5

The same mode of data collection should be used for all subjects (2 points), if not: 1 point

 

6

– The data have been collected directly from the patient by means of a validated questionnaire/interview (3 points)

  

 – No validated questionnaire/interview patients (2 points)

  

 – Data have been collected from proxies or retrospectively from medical record (1 point).

C

 

General description of the method and results should include:

 

7

Description of target population and setting where patients were found (2 points)

 

8

Description of stage of disease, sex, age (all 2 points, 1 or 2: 1 point)

 

9

Final sample size (1 point)

D

 

Definition of FOG prevalence

 

10

Prevalence recall periods should be stated (1 point)