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Table 3 MetaXL quality assessment score

From: Global prevalence of Rett syndrome: systematic review and meta-analysis

Study

1. Population and observation period

2. Diagnostic criteria

3. Methods of case ascertainment

4. Administration of measurement protocol

5. Catchment area

6. Prevalence measure

Total (max: 11)

Aguilera et al. [18] (2007)

1

1

2

3

2

2

11

Bienvenu et al. [13] (2006)

1

1

2

1

2

2

9

Isaksen et al. [22] (2012)

1

1

2

3

2

2

11

Chakrabarti et al. [20] (2005)

1

1

2

2

2

1

9

Fombonne et al. [19] (2003)

1

1

1

3

2

2

10

Magnússon et al. [14] (2001)

1

1

1

1

2

2

8

Strømme et al. [15] (2000)

1

1

2

3

2

2

11

Sarajlija et al. [17] (2015)

1

1

1

2

2

2

9

Fehr et al. [21] (2011)

1

1

2

2

2

2

10

Wong et al. [22] (2007)

1

1

2

2

2

2

10

  1. 1) Yes = 1, no = 0
  2. 2) Diagnostic system reported = 1. Own system/symptoms described/no system/not specified = 0
  3. 3) Community survey/multiple institutions = 2. Inpatient/inpatients and outpatients/case registers = 1. Not specified = 0
  4. 4) Administered interview = 3. Systematic case note review = 2. Chart diagnosis/case records = 1. Not specified = 0
  5. 5) Broadly representative (national or multi-site survey) = 2. Small area/not representative (single community, single university) = 1. Convenience sampling/other (primary care sample/treatment group) = 0
  6. 6) Point prevalence (e.g., 1-month prevalence = 2; 12-month prevalence = 1; lifetime prevalence = 0)