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Table 1 Methodological quality evaluation with the quality assessment of diagnostic accuracy studies questionnaire

From: Pictorial blood loss assessment chart for quantification of menstrual blood loss: a systematic review

Quality Question no. and primary characteristic Study
Higham [4] Janssen [3] Deeny [8] Barr [9] Reid [10] Wyatt [11] Zakherah [12]
Generalizability Q1: spectrum of patients + + + + +
Clarity Q2: selection criteria + + + + + + +
  Q8: index test + + + + + + +
  Q9: reference test + + + + + + +
  Q13: uninterruptible/intermediate test results + + + + + +
  Q14: withdrawals + + + + + + +
Validity Q3: reference test + + + + + + +
  Q4: time between reference test and index test + + + + + + +
  Q5: verification using reference test + + + + + + +
  Q6: reference standard regardless of index test results + + + + + + +
  Q7: reference standard independent of the index test + + + + + + +
  Q10: blinding to reference test
  Q11: blinding to index test
  Q12: same data available before interpretation of both index and reference tests + + + + + + +
  1. The information is from Whiting et al. [13]. In the questionnaire, plus sign indicates “yes,” minus sign indicates “no,” and question mark indicates “unclear.”