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Table 2 Internal consistency item-total correlation; and EFA Communalities

From: Cross-cultural adaptation, validity, and reliability of the Persian version of the spine functional index

Items

Internal consistency C-Alpha

EFA Communalities

Corrected Item-Total correlation

Initial

Extraction

s1

.279

.330

.253

s2

.338

.342

.999

s3

.067

.179

.145

s4

.352

.442

.999

s5

.346

.395

.375

s6

.463

.393

.336

s7

.343

.261

.197

s8

.296

.210

.111

s9

.419

.376

.490

s10

.574

.481

.600

s11

.495

.398

.385

s12

.460

.454

.542

s13

.528

.527

.651

s14

.511

.475

.483

s15

.455

.421

.394

s16

.495

.384

.360

s17

.521

.537

.666

s18

.526

.540

.638

s19

.495

.464

.543

s20

.483

.448

.505

s21

.553

.511

.573

s22

.468

.414

.339

s23

.389

.458

.524

s24

.517

.450

.499

s25

.581

.541

.612