Table 1.
Descriptive Baseline Characteristics for the Subjects According to the Categories of CRF
| Variables | Overall (n = 11,418) | Categories of CRF
|
p for Linear Trend | ||
|---|---|---|---|---|---|
| Low (n = 5,130) | Middle (n = 3,625) | High (n = 2,663) | |||
| Age, yrs | 43.8 ± 9.0 | 44.2 ± 8.7 | 43.9 ± 9.0 | 43.0 ± 9.5 | <0.0001 |
| Total cholesterol, mg/dl | 202.6 ± 36.1 | 207.6 ± 36.8 | 201.6 ± 34.9 | 194.4 ± 34.6 | <0.0001 |
| LDL-C, mg/dl | 132.3 ± 32.5 | 136.2 ± 32.8 | 132.0 ± 31.7 | 125.1 ± 31.6 | <0.0001 |
| TG, mg/dl | 117.7 ± 79.0 | 140.9 ± 94.3 | 107.6 ± 64.2 | 86.8 ± 43.6 | <0.0001 |
| HDL-C, mg/dl | 47.1 ± 12.0 | 43.9 ± 11.0 | 48.0 ± 11.7 | 52.1 ± 12.4 | <0.0001 |
| Non-HDL-C, mg/dl | 155.5 ± 37.1 | 163.7 ± 37.5 | 153.6 ± 35.5 | 142.3 ± 34.4 | <0.0001 |
| TG/HDL-C ratio | 2.88 ± 3.28 | 3.67 ± 4.02 | 2.53 ± 2.83 | 1.84 ± 1.28 | <0.0001 |
| TC/HDL-C ratio | 4.57 ± 1.43 | 5.00 ± 1.51 | 4.43 ± 1.32 | 3.91 ± 1.07 | <0.0001 |
| LDL-C/HDL-C ratio | 2.99 ± 1.09 | 3.27 ± 1.13 | 2.92 ± 1.03 | 2.54 ± 0.92 | <0.0001 |
| Maximal METS | 12.4 ± 2.3 | 10.5 ± 1.2 | 12.8 ± 0.8 | 15.4 ± 1.6 | <0.0001 |
| Treadmill time duration, min | 19.5 ± 4.6 | 15.5 ± 2.6 | 20.6 ± 1.7 | 25.4 ± 2.4 | <0.0001 |
| Height, cm | 179.4 ± 6.5 | 179.1 ± 6.6 | 179.6 ± 6.4 | 179.4 ± 6.4 | 0.0028 |
| Weight, kg | 83.4 ± 12.2 | 87.6 ± 13.6 | 82.0 ± 10.2 | 77.4 ± 8.5 | <0.0001 |
| BMI, kg/m2 | 25.9 ± 3.3 | 27.3 ± 3.7 | 25.4 ± 2.6 | 24.0 ± 2.0 | <0.0001 |
| Waist circumference, cm | 92.3 ± 9.7 | 96.9 ± 10.0 | 90.8 ± 7.8 | 85.7 ± 6.6 | <0.0001 |
| Percent body fat | 20.3 ± 6.1 | 23.4 ± 5.6 | 19.5 ± 5.0 | 15.5 ± 5.0 | <0.0001 |
| Fasting plasma glucose, mg/dl | 98.5 ± 13.3 | 100.1 ± 15.6 | 97.7 ± 12.0 | 96.6 ± 9.2 | <0.0001 |
| Systolic blood pressure (mm Hg) | 119.5 ± 12.6 | 120.3 ± 12.6 | 118.8 ± 12.3 | 119.1 ± 12.7 | <0.0001 |
| Diastolic blood pressure (mm Hg) | 80.0 ± 9.1 | 81.5 ± 9.4 | 79.2 ± 8.9 | 78.2 ± 8.4 | <0.0001 |
| Diabetes | 314 (2.8) | 209 (4.1) | 69 (1.9) | 36 (1.4) | <0.0001 |
| Hypertension | 2,789 (24.4) | 1,540 (30.0) | 785 (21.7) | 464 (17.4) | <0.0001 |
| Current smoker | 1,652 (14.5) | 1,035 (20.2) | 428 (11.8) | 189 (7.1) | <0.0001 |
| Heavy drinker | 762 (6.7) | 321 (6.3) | 239 (6.6) | 202 (7.6) | 0.0319 |
| Physical inactivity | 2,226 (19.5) | 1,764 (34.4) | 374 (10.3) | 88 (3.3) | <0.0001 |
| Parental history of CVD | 3,034 (26.6) | 1,423 (27.7) | 933 (25.7) | 678 (25.5) | 0.0175 |
Data are presented as means ± SD or number (proportions). Linear trend for TG and TG/HDL-C ratio was tested after log-transformation due to excessive skewness. CRF was categorized into low (lower than 33.3th percentile), middle (those within 33.3th to 66.7th percentile) and high CRF categories (higher than 66.7th percentile) according to the distribution of age-standardized CRF at baseline.
BMI = body mass index; CRF = cardiorespiratory fitness; CVD = cardiovascular disease; HDL-C = high-density lipoprotein cholesterol; LDL-C = low-density lipoprotein cholesterol; MET = metabolic equivalent; TC = total cholesterol; TG = triglycerides.