Table 2.

Summary estimates of sensitivity, specificity, DOR, LR+, LR−, SROC curve (AUC ± SE, Q^* ± SE) of US and MRI for identification of PAS in different subgroup

Subgroup		Sensitivity (%) (95% CI)	Specificity (%) (95% CI)	DOR (95% CI)	LR + (95% CI)	LR− (95% CI)	SROC curve AUC ± SE	SROC curve Q* ± SE
Prosp [9, 10, 12, 17, 18, 20, 23, 24]	US	92 (87–96)	86 (81–90)	77 (27–220)	8.63 (3.21–23.16)	0.10 (0.06–0.18)	0.96 ± 0.01	0.90 ± 0.02
	MRI	93 (88–97)	91 (87–94)	96 (24–385)	8.05 (3.79–17.11)	0.12 (0.05–0.25)	0.96 ± 0.02	0.91 ± 0.03
Retro [11, 13–16, 19, 21, 22, 25, 26]	US	88 (83–92)	80 (75–85)	24 (10–57)	3.55 (2.09–6.03)	0.21 (0.13–0.34)	0.90 ± 0.03	0.83 ± 0.03
	MRI	85 (79–90)	82 (77–87)	21 (8–54)	4.09 (2.52–6.64)	0.22 (0.13–0.37)	0.89 ± 0.04	0.83 ± 0.04
Earlier studies [9–17]	US	90 (83–94)	88 (83–92)	51 (16–161)	6.24 (2.40–16.24)	0.17 (0.10–0.28)	0.94 ± 0.02	0.88 ± 0.03
	MRI	90 (84–95)	89 (85–93)	62 (13–305)	6.77 (2.68–17.11)	0.14 (0.06–0.33)	0.97 ± 0.01	0.92 ± 0.02
Recent studies [18–26]	US	90 (85–94)	79 (74–84)	32 (13–78)	4.38 (2.68–7.15)	0.16 (0.09–0.27)	0.91 ± 0.04	0.84 ± 0.04
	MRI	88 (82–92)	85 (80–88)	30 (13–67)	5.00 (3.79–6.6)	0.19 (0.11–0.32)	0.90 ± 0.02	0.83 ± 0.02

US, ultrasonography; MRI, magnetic resonance imaging; PAS, placenta accrete spectrum disorder; DOR, diagnostic odds ratio; LR+, positive likelihood ratios; LR−, negative likelihood ratios; SROC, summary receiver operating characteristic; AUC, area under the SROC curve; SE, standard error