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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”