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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

SortsSubsortsQuality criteria
A The final sample should be representative of the target population
 1At 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
 2At least one of the following (2 points)
   – Reasons for nonresponders described
   – Nonresponders described
   – Comparison of responders and nonresponders
   – Comparison of sample and target population
 3Response rate > 90% (2 points)
   Response rate 70% to 90% (1 point)
   Response rate ≤ 70% (0 points)
B Quality of data
 4Were the data primary from a prevalence study (2 points) or was it taken from a survey not specifically designed for that purpose (1 point)?
 5The 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:
 7Description of target population and setting where patients were found (2 points)
 8Description of stage of disease, sex, age (all 2 points, 1 or 2: 1 point)
 9Final sample size (1 point)
D Definition of FOG prevalence
 10Prevalence recall periods should be stated (1 point)