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Table 3 Internal consistency of the CREDI, Bayley-III, and ASQ-3 (Overall and by age groups)

From: Reliability and validity of the Caregiver Reported Early Development Instruments (CREDI) in impoverished regions of China

Test

Scales

Cronbach’s alpha

Total

6–11 months

12–17 months

18–23 months

24–29 months

30–35 months

CREDI

Cognitive

0.9395

0.8498

0.8632

0.8154

0.8227

0.7634

Language

0.9693

0.8720

0.9057

0.9287

0.9121

0.8886

Motor

0.9374

0.8085

0.8258

0.7440

0.6844

0.6606

Social-emotional

0.9178

0.8213

0.8624

0.7977

0.6546

0.6040

Bayley-III

Cognitive

0.9773

0.9701

0.9718

0.9738

0.9454

0.8752

Expressive communication

0.9722

0.9650

0.9708

0.9654

0.9450

0.9027

Receptive communication

0.9720

0.9703

0.9712

0.9638

0.9466

0.9256

Fine motor

0.9685

0.9645

0.9767

0.9803

0.9415

0.8641

Gross motor

0.9724

0.9648

0.9606

0.9456

0.8989

0.7931

ASQ-3

Problem Solving

0.5450

0.5945

0.7075

0.3741

0.4183

0.6397

Communication

0.6314

0.4898

0.4886

0.7164

0.6684

0.5210

Fine Motor

0.6081

0.6196

0.6512

0.4847

0.6034

0.6635

Gross Motor

0.6963

0.5896

0.8040

0.5078

0.5555

0.4951

Personal-Social

0.4084

0.5134

0.5145

0.3487

0.4786

0.4246

  1. Note: In our case, we treated the items as binary items in the analysis, thus we follow Hill & Lewicki [13]‘s suggestion which stated that “Cronbach’s alpha, when computed for binary (e.g., true/false) items, is identical to the so-called Kuder-Richardson-20 formula of reliability for sum scales”
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BMC Pediatrics

ISSN: 1471-2431

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