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

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

Quality	Question no. and primary characteristic	Study
Quality	Question no. and primary characteristic	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	+	+	+	+	+	+	+

The information is from Whiting et al. [13]. In the questionnaire, plus sign indicates “yes,” minus sign indicates “no,” and question mark indicates “unclear.”