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Table 1 Baseline characteristics of studies that satisfied the inclusion criteria (TP = true positive, FP = false positive, TN = true negative, FN = false negative)

From: Use of the A2DS2 scale to predict morbidity in stroke-associated pneumonia: a systematic review and meta-analysis

Author Region Year Type Sample size TP FP FN TN The values of the A2DS2
Yang L [15] China 2019 retrospective 2552 138 637 62 1715 4
Ren XY [16] China 2019 retrospective 530 75 89 15 351 5
Yang R [17] China 2019 prospective 86 16 18 3 49 5
Mao BY [18] China 2018 prospective 80 44 7 1 28 5
Zhang Y [9] China 2017 retrospective 2552 162 889 37 1464 3
Pi CX [19] China 2019 retrospective 215 31 18 13 153 5
Wang N [20] China 2018 prospective 271 85 15 18 153 5
Hang J [21] China 2017 retrospective 1472 257 158 138 874 5
Luo XN [22] China 2018 retrospective 203 27 19 19 138 4.5
Zhang YP [23] China 2019 retrospective 201 24 27 7 143 7
Shan Y [24] China 2018 retrospective 252 27 19 20 186 6.5
Yuan Y [25] China 2018 retrospective 512 61 57 24 427 4
Yang JF [26] China 2014 retrospective 636 80 64 12 480 7
Zhang XP [1] China 2016 retrospective 1239 57 174 33 975 5
Shang YC [27] China 2013 retrospective 131 30 23 8 70 5
Li Y [28] China 2014 prospective 1142 130 70 85 857 5
Gong SY [29] China 2016 retrospective 1569 168 455 72 874 3
Lu Y [30] China 2015 prospective 101 49 17 2 33 5
Li L [31] China 2014 retrospective 1279 198 78 110 893 10
Batubara CA [32] Indonesia 2015 retrospective 32 20 6 2 4 5
Limesh V [33] India 2019 prospective 250 44 71 2 133 5
Tu TM [34] Singapore 2017 retrospective 731 36 173 4 518 7
Zapata AE [35] Spain 2017 prospective 201 27 86 4 84 5
Ramírez-Moreno J.M [36] Spain 2016 prospective 224 30 31 15 209 6
Yota K [37] Japan 2019 retrospective 111 14 26 3 68 5
Nam KW [2] Korea 2017 retrospective 299 24 38 18 219 5
Cugy E [38] French 2017 retrospective 1960 126 365 43 1426 5
Helmy TA [39] Egypt 2016 prospective 70 20 7 6 37 6
HElhasina [40] Arab 2019 prospective 200 37 134 5 24 5
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