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Table 3 Results of factor analysis for low birth weight risk assessment scale (25 items)

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

Items Reliability (Cronbach’s α) Factor loadings n Mean SD Range
1 2 3 4 5 6 7 8 9
1. Guidance at each checkup 0.775           909 10.8 3.5 5–20
 I restricted my food intake as I was concerned about gaining weight   0.727             
 During pregnancy checkups, I was often given advice about my weight gain by medical staff   0.723             
 I did not like going to checkups because the medical staff frequently advised me about my weight gain during previous pregnancy checkups   0.716             
 I was always concerned about weight gain   0.630             
 I restricted my food intake as I was concerned about gaining weight   0.425             
2. Adequate rest 0.778           915 11.2 2.7 4–16
 I took adequate rest    0.923            
 I took holidays    0.898            
 I slept well    0.428            
 When I woke from my sleep, I felt refreshed    0.399            
3. Support from husband 0.900           914 5.8 1.9 2–8
 I am satisfied with my husband’s support     0.901           
 My husband thoroughly supported me     0.898           
4. Effects on fetus 0.895           910 6.4 2.3 2–8
 I thought about the effects of alcohol consumption on the fetus      0.910          
 I thought about the effects of smoking on the fetus      0.899          
5. Support from society 0.861           913 5.3 2.0 2–8
 People other than my husband and parents (including in-laws) thoroughly supported me       0.904         
 I am satisfied with the support that I received from others besides my husband and parents (including in-laws)       0.809         
6. Support from family 0.853           916 6.5 1.7 2–8
 I am satisfied with my parents’ (including in-laws) support        0.901        
 My parents (including in-laws) thoroughly supported me        0.798        
7. Effects of minor troubles 0.648           908 6.7 2.2 3–12
 I had severe morning sickness         0.818       
 At one point, I believed that severe morning sickness must be hereditary         0.647       
 I experienced unpleasant symptoms such as headaches         0.416       
8. Good lifestyle habits 0.585           916 8.3 1.8 3–12
 I tried to eat well-balanced meals          0.687      
 I was able to lead a regular lifestyle          0.520      
 I exercised adequately          0.415      
9. Fall risk and lifestyle changes 0.697           913 7.5 1.1 2–8
 I was careful not to fall           0.795     
 I switched to shoes with low heels           0.676     
Scale total scores            888 68.5 8.1 32–93
 Inter-factor correlation 1 1.00             
2 −0.107 1.00            
3 −0.005 0.191 1.00           
4 0.069 − 0.007 −0.034 1.00          
5 −0.018 0.132 0.342 0.016 1.00         
6 0.009 0.186 0.395 0.026 0.417 1.00        
7 0.147 −0.084 −0.018 0.136 −0.015 0.056 1.00       
8 0.045 0.336 0.135 0.158 0.071 0.033 −0.117 1.00      
9 0.135 0.051 0.084 0.234 0.080 0.135 0.053 0.131      
  1. Overall Cronbach’s α coefficient, 0.701; cumulative contribution rate of nine factors extracted by principal factor analysis and promax rotation, 57.0%; SD, standard deviation