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Table 1 Characteristics of studies

From: Drug resistance predictive utility of age of onset and cortical imaging abnormalities in epilepsy: a systematic review and meta-analysis

Author

Year

Country

Study design

Medical condition

Types of seizures

Sample size

Mean age/median age in years

Male-to-female ratio(M/F)

Chen [18]

2021

China

Retrospective case–control

Epilepsy

141

Mean (± SD)

33.49 (± 1.42)

89/52

Taghreed l [19]

2018

Egypt

Retrospective case–control

Refractory epilepsy

Partial seizure, generalized seizure, multiple seizure

186

93 case

93 control

Mean (± SD)

5.7 (± 3.0) refractory group

5.4 (± 2.9) responsive group

118/68

Jeong [20]

2017

USA and Belgium

Retrospective case–control

Epilepsy and tuberous sclerosis complex

Infantile seizure, focal seizure, others

1546

Median (IQR)

16 (9.6 – 25.5)

803/743

Gasparin Sara [21]

2013

Italy

Retrospective case–control

Cryptogenic focal epilepsy

186

Median (IQR)

25 (9–99)

105/81

Rawat [22]

2018

India

Prospective cohort

Epilepsy

1056

Median (IQR)

20 (5–67)

665/391

Berg [23]

2011

USA

Prospective cohort

Epilepsy

613

Berg [24]

2014

USA

Prospective cohort

Epilepsy

599

307/292

Karaoglu [25]

2021

Turkey

Retrospective case–control

Epilepsy

458

Mean (± SD)

7.37 (± 4.72)

248/210

Lattanzi [26]

2021

Italy

Retrospective case–control

Post-stroke epilepsy

Focal onset, focal to bilateral tonic–clonic, generalized, unknown

159

104/55

Ramos-Lizana [27]

2009

Spain

Prospective cohort

Epilepsy

Partial, generalized

343

Mean (± SD)

4.8 (± 3.8)

191/152

Ayca [28]

2019

Turkey

Retrospective case–control

Epilepsy

Generalized tonic–clonic, myoclonic

241

Mean (± SD)

7.00 (± 4.36)

Intractable group

7.00 (± 4.36)

Control group

130/111

Tripathi [29]

2011

India

Retrospective case–control

Intractable epilepsy and well-controlled epilepsy

Generalized, partial, myoclonic, other/mixed

400

200 intractable

200 control

Case 142/58

Control 128/72

  1. SD standard deviation, IQR interquartile range, USA United States of America