TABLE 1.
Baseline characteristics of the PREDIMED nested case-cohort study population1
| Total | Cases | Noncases | P | |
| n | 980 | 229 | 751 | |
| Age, y | 67.6 ± 6 | 69.4 ± 6.5 | 67.0 ± 6 | <0.01 |
| Women | 528 (53.9) | 91 (39.7) | 437 (58.1) | <0.01 |
| BMI, kg/m2 | 29.7 ± 3.7 | 29.6 ± 3.7 | 29.7 ± 3.6 | 0.67 |
| Intervention group | 0.15 | |||
| MedDiet + EVOO | 363 (37.0) | 82 (35.8) | 281 (37.4) | |
| MedDiet + nuts | 314 (32.0) | 65 (28.4) | 249 (33.1) | |
| Control group | 303 (30.9) | 82 (35.8) | 221 (29.4) | |
| Family history of CHD | 237 (24.2) | 44 (19.2) | 193 (25.7) | 0.04 |
| Hypertension | 817 (83.3) | 189 (82.5) | 628 (83.6) | 0.69 |
| Dyslipidemia | 692 (70.6) | 134 (58.5) | 558 (74.3) | <0.01 |
| Diabetes | 494 (50.4) | 147 (64.2) | 347 (46.2) | <0.01 |
| Smoking | <0.01 | |||
| Never | 578 (58.9) | 104 (45.4) | 474 (63.1) | |
| Former | 263 (26.8) | 79 (34.5) | 184 (24.5) | |
| Current | 139 (14.2) | 46 (20.1) | 93 (12.4) |
1
Baseline characteristics of participants are presented according to case status as means ± SDs for quantitative traits and as n (%) for categorical variables. P values are for comparisons between cases and controls (Pearson’s chi-square test was used for categorical variables, and a 1-factor ANOVA was used for continuous variables). CHD, family history of premature coronary heart disease (myocardial infarction or sudden death); EVOO, extra-virgin olive oil; MedDiet, Mediterranean diet; PREDIMED, Prevención con Dieta Mediterránea.