Demographical Characteristics of 40 Years or Older NHANES 1999–2010 Participants by Glucosamine/Chondroitin Use of 1 Year or Longer (n = 16,686)
| Characteristics | Glucosamine/Chondroitin User (n = 658), % (95% CI) | Glucosamine/Chondroitin Nonuser (n = 16,028), % (95% CI) | P-Value* |
|---|---|---|---|
| Age (years) | |||
| 40 to 49 | 16.7 (12.0 to 21.3) | 38.2 (36.6 to 39.7) | <.0001† |
| 50 to 59 | 29.6 (24.9 to 34.3) | 28.9 (27.7 to 30.0) | |
| 60 to 69 | 29.3 (24.7 to 33.9) | 17.2 (16.5 to 18.0) | |
| ≥70 | 24.5 (21.4 to 27.6) | 15.7 (14.9 to 16.6) | |
| Sex | |||
| Male | 42.7 (38.5 to 46.9) | 46.1 (45.2 to 46.9) | .13 |
| Female | 57.3 (53.1 to 61.5) | 53.9 (53.1 to 54.8) | |
| Race | |||
| Non-Hispanic White | 90.8 (88.3 to 93.3) | 74.8 (72.3 to 77.2) | <.0001† |
| Non-Hispanic Black | 2.1 (1.3-3.1) | 10.4 (9.0 to 11.8) | |
| Hispanic | 3.2 (1.9-4.4) | 10.1 (8.3 to 11.9) | |
| Other | 3.8 (1.8-5.8) | 4.7 (4.0 to 5.3) | |
| Body mass index | |||
| Underweight (<18.5 kg/m2) | 1.4 (0.03-2.8) | 1.4 (1.2-1.7) | .93 |
| Normal (18.5 to 24.9 kg/m2) | 26.9 (22.4 to 31.5) | 27.7 (26.5 to 28.8) | |
| Overweight (25–29.9 kg/m2) | 37.8 (33.3 to 42.3) | 36.1 (35.0 to 37.2) | |
| Obese (≥30 kg/m2) | 33.8 (29.2 to 38.4) | 34.8 (33.6 to 36.0) | |
| Education | |||
| ≥high school | 92.1 (89.6 to 94.6) | 80.3 (79.1 to 81.5) | <.0001† |
| <high school | 7.9 (5.4 to 10.4) | 19.7 (18.5 to 20.9) | |
| Smoking | |||
| Current smoker | 6.2 (3.4 to 9.0) | 20.3 (19.2 to 21.4) | <.0001† |
| Non-smoker | 93.8 (91.0 to 96.6) | 79.7 (78.6 to 80.8) | |
| Physical activity | |||
| ≥150 minutes/week | 59.0 (54.1 to 63.8) | 44.5 (42.7 to 46.3) | <.0001† |
| <150 minutes/week | 41.0 (36.2 to 45.9) | 55.5 (53.7 to 57.3) |