Table 1.
Basic characteristics of the study population.
| Stone Former | Non-Stone Former | p Value | ||
|---|---|---|---|---|
| Total number | 1895 | 17510 | ||
| Age (years) | 54 (±0.4) | 47 (±0.3) | <0.001 | |
| Sex (male %) | 985 (52) | 8230 (47) | 0.01 | |
| Race (Non-Hispanic White %) | 1421 (75) | 11,382 (65) | <0.001 | |
| BMI (mg/m2) | 30.9 (±0.2) | 29.2 (±0.1) | <0.001 | |
| History of hypertension (%) | 910 (48) | 5603 (32) | <0.001 | |
| History of diabetes (%) | 360 (19) | 1576 (9) | <0.001 | |
| History of dyslipidemia (%) | 872 (46) | 5778 (33) | <0.001 | |
| Cardiovascular disease (%) | 284 (15) | 1401 (8) | <0.001 | |
| Thiazide use (%) | 208 (11) | 1226 (7) | <0.001 | |
| Smoking (%) | Everyday/some day | 379 (20) | 3152 (18) | <0.001 |
| Past smoker | 569 (30) | 4202 (24) | ||
| Not at all | 948 (50) | 10,156 (58) | ||
| Alcohol (%) | Heavy | 38 (2) | 1051 (6) | 0.001 |
| Light | 360 (19) | 3852 (22) | ||
| None | 1477 (78) | 12,607 (72) | ||
| DSI | Mean (mg) | 3438 (±56) | 3532 (±17) | 0.1 |
| <2300 mg/d (%) | 493 (26) | 4202 (24) | 0.2 | |
| DPI | Mean (mg) | 2572 (±43) | 2665 (±17) | 0.03 |
| ≥3500 mg/d (%) | 360 (19) | 3677 (21) | 0.2 | |
| DSI/DPI | 1.5 (±0.03) | 1.4 (±0.01) | 0.2 | |
Values are expressed as means (±SE) or numbers (%). Abbreviations: BMI, body mass index. DSI, dietary sodium intake. DPI, dietary potassium intake.