Additional file 1 of Association between serum zinc levels and basic physical functioning: secondary data analysis of NHANES 2011–14

Additional file 1: Appendix Table 1A. The distribution of basic physical functioning difficulty in continuous variables (coded as 0 to 12) of NHANES 2011–14 participants aged 50 and older (total N = 1136). Appendix Table 1B. The distribution of counts in difficulty of basic physical functioning in four aspects (feeding, dressing, transferring, and walking) of NHANES 2011–14 participants aged 50 and older (total N = 1136). Appendix Table 2. Multivariate logistic regression analysis of factors associated with basic physical functioning difficulty in the 2011–14 NHANES data stratified by sex.