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Table 3 Summary of results of bifactor analyses

From: Development and calibration of a novel social relationship item bank to measure health-related quality of life (HRQoL) in Singapore

Item ID Item Single-factor CFA Exploratory Bifactor Analysis – general factor loadings
    2 specific factors 3 specific factors 4 specific factors Mean Item ECVs§
SQ01 I have a good relationship with my family 0.931 0.900 0.895 0.908 0.884
SQ32 I have someone to talk to about my problems 0.792 0.803 0.796 0.801 0.952
SQ39 I live harmoniously with others 0.790 0.800 0.796 0.798 0.941
SQ11 I communicate well with my family 0.940 0.921 0.915 0.926 0.918
SQ02 I participate in family activities 0.757 0.769 0.765 0.769 0.952
SQ33 I have someone who can provide me with information if I need it 0.777 0.789 0.785 0.786 0.974
SQ10 I take care of my family 0.772 0.768 0.775 0.782 0.835
SQ40 I communicate well with others 0.841 0.843 0.847 0.844 0.847
SQ12 I keep in touch with my family 0.879 0.864 0.870 0.878 0.897
SQ07 My family is willing to help with my daily tasks (e.g. shopping, giving me a ride, or helping me with household tasks) when I need it 0.700 0.711 0.709 0.712 0.922
SQ16 I keep in touch with my friends 0.762 0.689 0.699 0.671 0.598
SQ34 I know that I have someone to help me if I have financial difficulties 0.680 0.667 0.661 0.652 0.826
SQ41 I keep in touch with others 0.812 0.780 0.787 0.768 0.788
SQ04 I feel loved and cared for by my family 0.858 0.849 0.855 0.866 0.900
SQ08 My family is willing to give me information when I need it 0.835 0.828 0.831 0.841 0.895
SQ17 I communicate well with my friends 0.766 0.756 0.770 0.754 0.844
SQ43 I am able to socialize with others 0.718 0.702 0.717 0.701 0.798
SQ45 I feel loved and cared for 0.852 0.863 0.871 0.872 0.971
SQ31 I have someone I can go to for advice if I need it 0.763 0.757 0.744 0.749 0.703
SQ35 I give help to others 0.712 0.700 0.703 0.693 0.813
SQ44 I have someone who would spend time with me when I need company 0.827 0.822 0.815 0.811 0.858
SQ05 Overall, my family supports me when I need it 0.835 0.826 0.820 0.833 0.858
SQ18 I have gatherings with my circle of friends 0.686 0.630 0.628 0.606 0.607
SQ15 I give support to my friends 0.674 0.647 0.651 0.635 0.771
SQ37 I get along well with others 0.750 0.759 0.763 0.761 0.967
SQ06 My family is willing to listen when I need to talk about my worries and problems 0.788 0.783 0.774 0.788 0.830
SQ20 I spend time with my friends 0.670 0.598 0.600 0.576 0.536
SQ48 Overall, I am satisfied with the support I get from my friends 0.741 0.715 0.695 0.680 0.712
SQ50 Overall, I am satisfied with the support I give to others 0.753 0.732 0.705 0.694 0.662
SQ51 Overall, I am satisfied with how well I communicate with others 0.797 0.793 0.770 0.767 0.806
Bifactor analysis statistics
 ARPB   2.6 2.8 3.6  
 ECV   0.855 0.828 0.805  
 OmegaH   0.983 0.985 0.984  
 Hancock and Mueller’s H   0.995 0.992 0.985  
 Average ECVs of specific factors   0.072 0.057 0.049  
  1. Data within single factor CFA, bifactor analysis (2-specific factors, 3-specicifc factors and 4-specific factors) represented factor loadings. Abbreviations: Confirmatory factor analysis (CFA), explained common variance (ECV), omega hierarchical (omegaH)