Table 1. Baseline characteristics of variables appearing in the final AIC and BIC models (N = 1518).
| Variable | Mean ± SD or N (%) | Reference values, if applicablea |
|---|---|---|
| Age, years | 46.3 ± 15.5 | |
| Female sex | 782 (51.5%) | |
| Smoking status | ||
| Never smoker | 540 (35.6%) | |
| Ex-smoker | 496 (32.7%) | |
| Current smoker | 482 (31.8%) | |
| Household equivalent income, € | 981.4 ± 483.3 | |
| SF-12 sum-score of physical health | 49.1 ± 8.2 | 100: best health score |
| Mean attachment loss, mm | 2.65 ± 1.95 | |
| Depression, yes | 189 (12.5%) | |
| Diabetes mellitus, yes | 124 (8.2%) | |
| Treated dyslipidemia, yes | 166 (10.9%) | |
| Treated gastritis, yes | 82 (5.4%) | |
| Treated osteoporosis, yes | 47 (3.1%) | |
| Number of drugs taken within the last 7 days | 1.77 ± 2.13 | |
| Antihypertensives, yes | 333 (21.9%) | |
| Sex hormones and modulators of the genital system, yes | 270 (17.8%) | |
| HMG CoA reductase inhibitors, yes | 85 (5.6%) | |
| Drugs used in benign prostatic hypertrophy, yes | 51 (3.4%) | |
| Serum calcium, mmol/l | 2.4 ± 0.1 | 2.15–2.50 mmol/l |
| Ferritin, μg/l | 96.6 ± 105.6 | f: 10–150 μg/l; m: 30–300 μg/l |
| IGF-1, ng/ml | 150.2 ± 59.4 | strongly age dependent |
| Fibrinogen, g/l | 2.9 ± 0.7 | 1.5–3.5 g/l |
| Albumin/creatinine ratio, mg/mmol | 21.9 ± 68.0 | < 3 mg/mmol |
| Red blood cell count, Tpt/l | 4.4 ± 0.4 | f: 3.7–5.0 Tpt/l; m: 4.2–5.5 Tpt/l |
| Hemoglobin, mmol/l | 8.4 ± 0.8 | 7.5–11 mmol/l |
| Mean corpuscular hemoglobin concentration, mmol/l | 21.2 ± 0.6 | 19.9–22.3 mmol/l |
asource: Merck Manual (Professional Version). Continuous variables are described by mean ± standard deviation (SD); categorical variables are described by Number (%). IGF-1, Insulin like growth factor 1