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Fig. 1 | BMC Health Services Research

Fig. 1

From: A low-birth-weight risk assessment scale: development and validation through a questionnaire-based survey

Fig. 1

Factor analysis. a A total of 11 factors were extracted with factor analysis using principal factor analysis and promax rotation conducted on 33 items. The 11th factor had a low Cronbach’s α coefficient of 0.363. b Item 5, “I consumed alcohol,” which had the lowest coefficient value in the inter-item correlation matrix, was excluded, and factor analysis was repeated; however, Cronbach’s α coefficient remained low. c Item 13, “I often experienced abdominal bloating,” was excluded, and factor analysis was repeated on 31 items. 10 factors were extracted; however, the 10th factor had a low Cronbach’s α coefficient. d Item 33, “I thought that the saying, ‘deliver them small and raise them big’ held true for me and my child(ren),” was excluded, and factor analysis was repeated on 30 items; however, Cronbach’s α coefficient for the 10th factor remained low. e Item 24, “I refrained from driving,” was excluded, and factor analysis was repeated for 29 items. Finally, 9 factors were extracted, and the lowest Cronbach’s α coefficient increased to 0.460. f Four items (items 4, 21, 25 and 32) with factor loading under 0.35 were excluded, and factor analysis was repeated, finally extracting nine factors. The lowest Cronbach’s α coefficient for these nine factors was 0.585, and the overall Cronbach’s α coefficient for entire scale was 0.701

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