Table 2.
Frequency of dietary supplements discussed by year of data collection
| Total | 1998–1999 | 2004–2005 | 2009–2010 | |
|---|---|---|---|---|
|
| ||||
| n (mean per visit) | 738 (2.1 / visit) | 214 (2.1 / visit) | 265 (1.7 / visit) | 259 (2.7 / visit) |
|
| ||||
| Vitamins / Minerals | 525 | 150 | 191 | 184 |
|
| ||||
| Calcium, vitamin D * | 169 (22.9) | 34 (15.9) | 56 (21.1) | 79 (30.5) |
| MVI | 80 (10.8) | 19 (8.9) | 31 (11.7) | 30 (11.6) |
| Prenatal vitamins/folic acid | 22 (3.0) | 8 (3.7) | 9 (3.4) | 5 (1.9) |
| Potassium † | 42 (5.6) | 12 (5.6) | 22 (8.3) | 8 (3.1) |
| Iron ‡ | 29 (3.9) | 14 (6.5) | 13 (4.9) | 2 (0.8) |
| Niacin | 13 (1.8) | 2 (0.9) | 6 (2.3) | 5 (1.9) |
| Other vitamins / minerals | 170 (23.1) | 61 (28.5) | 54 (20.4) | 55 (21.2) |
|
| ||||
| Non-vitamin non-mineral dietary supplements | 213 | 64 | 74 | 75 |
|
| ||||
| Glucosamine chondroitin † | 40 (5.4) | 18 (8.4) | 15 (5.7) | 7 (2.7) |
| Fish oil / omega 3 * | 35 (4.7) | 0 | 13 (4.9) | 22 (8.5) |
| Fiber supplement | 22 (3.0) | 8 (3.7) | 9 (3.4) | 5 (1.9) |
| Other natural products | 116 (15.7) | 38 (17.8) | 37 (14.0) | 41 (15.8) |
†
p < 0.05
‡
p < 0.01
*
p < 0.001