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Table 3 Quality assessment of included studies

From: Spiral artery blood flow during pregnancy: a systematic review and meta-analysis

Domain Items for consideration Alouini (ref. [20]) Coppens (ref. [21]) Deurloo (ref. [2]) Deurloo (ref. [22]) Hsieh (ref. [23]) Kurjak (ref. [24]) Kurjak (ref. [25]) Mäkikallio (ref. [26]) Mäkikallio (ref. [27]) Matijevic (ref. [9]) Ozkan (ref. [15]) Ozkaya (ref. [28])
Study participation Adequate description of participants’ characteristics             
• Parity or gravidity + + + +
• Health or comorbidities of participants + + + + +
• Clear reporting of weeks amenorrhea + + + + + + + + + + + +
• Ethnicity
• Age + + + + + + + + +
• Non-pregnant weight/BMI + +
• Use of medication or supplements +
Adequate description of participant recruitment + + + + + + + +
Adequate description of inclusion and exclusion criteria + + + + + + + + +
Study attrition Reasons for loss to follow-up/drop-out are provided +
Adequate description of participants lost to follow-up/ differences between participants who completed and drop-outs
Outcome measurement Method of measurement is adequately valid and reliable + + + + + + + + + + + +
The methods and setting are the same for all study participants and throughout follow up + + + + + + + + + + +
Data reporting Data is extractable as mean with standard deviation for analysis + + + + + + + + + + + +
Study design Study used a longitudinal study design + + + + + + +
Multiple (> 2) longitudinal pregnant measurements during pregnancy of the variable ? + + + + + ? + + ? ? ?
Assessment of intra- and/or inter-observer variation is performed + + + +
Count (+) 4 7 12 13 11 5 9 11 10 6 7 8
Score % 24 41 71 76 65 29 53 65 59 35 41 47
Quality Low Medium High High High Low Medium High Medium Low Medium Medium
  1. Ref. reference number