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Table 2 Characteristics of NHANES 2011–14 participants aged 50 years and older with and without self-reported basic physical functioning difficulty

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

  Basic physical functioning difficulty  
Variables+ YES
(N = 283; 24.9%)
NO
(N = 853; 75.1%)
P value
Age (+/− SE) years 65.7 +/−  0.8 67.1 +/−  0.4 0.134
(95% CI) (64.1–67.3) (66.3–67.8)  
Sex    0.792
 Male (n = 561) 133 (21.4%) 428 (78.6%)  
 Female (n = 575) 150 (22.3%) 425 (77.7%)  
BMI    0.075
 Under (n = 19) 9 (27.1%)+ 10 (72.9%)+  
 Normal (n = 301) 59 (18.0%) 242(82.0%)  
 Overweight (n = 400) 89 (19.4%) 311 (80.6%)  
 Obese (n = 416) 126 (27.1%) 290 (72.9%)  
Race/ethnicity    0.014
 Non-Hispanic White (n = 533) 130 (20.3%) 403 (79.7%)  
 Non-Hispanic Black (n = 261) 70 (28.1%) 191 (71.9%)  
 Others (n = 342) 83 (26.6%) 259 (73.4%)  
Education    0.029
  < High school (n = 352) 105 (27.3%) 247 (72.7%)  
  = High school (n = 253) 66 (26.9%) 187 (73.1%)  
  > High school (n = 531) 112 (18.3%) 419 (81.7%)  
Health insurance    0.852
 Yes (n = 1001) 253 (21.8%) 748 (78.2%)  
 No (n = 135) 30 (22.8%) 105 (77.2%)  
Drinker    0.068
 Yes (n = 605) 129 (18.9%) 476 (81.1%)  
 No (n = 531) 154 (26.6%) 377 (73.4%)  
Smoking    0.008
 Never (n = 541) 120 (18.6%) 421 (81.4%)  
 Former (n = 410) 108 (22.1%) 302 (77.9%)  
 Current (n = 185) 55 (32.7%) 130 (67.3%)  
Physical activity    0.012
 Non-sedentary (n = 405) 68 (15.5%) 337 (84.5%)  
 Sedentary (n = 731) 215 (26.2%) 516 (73.8%)  
Diabetes    0.004
 Yes (n = 277) 86 (31.7%) 191 (68.3%)  
 No (n = 859) 197 (19.2%) 662 (80.8%)  
Serum albumin (gm/dL)§    0.088
 (mean +/− SE) 4.16+/− 0.03 4.23+/−0.02  
Hemoglobin (gm/dL)    0.038
 (mean +/− SE) 13.75 +/− 0.14 14.06 +/− 0.06  
 (95% CI) (13.46–14.04) (13.93–14.18)  
  1. + All percentages reported here are based on a weighted percentage
  2. § converting to SI unit (g/L) by multiplying 10
  3. Abbreviation: BMI = body mass index