Table 2.
Characteristics of the Los Angeles Atherosclerosis Study (LAAS) Subjects by Quintile of Vitamin C Intake from Food. Data are from LAAS, 1994-1999 (N=500)
| Vitamin C Intake from food (By Quintile) | P-value | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| Sample Size (n) | 96 | 101 | 106 | 100 | 97 | |
| Intake (mg/day) | ||||||
| Minimum | 17.9 | 54.6 | 77.8 | 104.9 | 146.1 | |
| Maximum | 54.1 | 77.6 | 104.6 | 145.8 | 395.3 | |
| Potential Confounders | ||||||
| Sex (% women) | 66.7 | 41.6 | 48.1 | 45.0 | 30.9 | 0.0001 |
| Current smokers (%) | 40.6 | 28.7 | 26.4 | 23.0 | 17.5 | 0.006 |
| Mean | ||||||
| Age at Baseline (year) | 50.1 | 49.6 | 50.6 | 49.9 | 48.9 | 0.14 |
| Physical Activity (Sessions/wk) | 2.1 | 2.0 | 2.1 | 2.2 | 2.5 | 0.39 |
| Alcohol Intake (g/day) | 7.6 | 7.6 | 6.2 | 6.0 | 7.7 | 0.67 |
| Cold/flu (episodes/year) | 1.06 | 1.12 | 1.01 | 0.98 | 1.13 | 0.68 |
| Serum Cholesterol (mmol/L) | 5.62 | 5.75 | 5.52 | 5.53 | 5.63 | 0.43 |
| Systolic Blood Pressure (mmHg) | 128.5 | 128.8 | 128 | 129.2 | 125.8 | 0.36 |
| Carotid IMT at baseline (µm) | 659 | 668 | 670 | 672 | 657 | 0.75 |