Table 2. Demographic characteristics and laboratory measurements in elderly male smokers, both resistant and non-resistant to cigarette smoke.
| Cigarette smoke non-resistant n = 57 | Cigarette smoke resistant n = 60 | P | |
| Age, years | 74.9 (3.4) | 74.3 (2.9) | 0.356 |
| Body mass index, kg/m2 | 22.3 (3.1) | 23.5 (3.3) | 0.046 |
| Brinkman index, cigarette years | 985.3 (401.6) | 973.3 (408.2) | 0.873 |
| Red blood cell count, 104/µL | 438.8 (48.0) | 449.3 (47.3) | 0.237 |
| Haemoglobin, g/dL | 14.1 (1.5) | 14.5 (1.3) | 0.208 |
| Haematocrit, % | 42.0 (4.5) | 42.8 (3.8) | 0.291 |
| Serum Fe, µg/dL | 107.8 (47.7) | 121.6 (38.7) | 0.016 |
| Albumin, g/dL | 4.4 (0.4) | 4.5 (0.3) | 0.085 |
| Aspartate aminotransferase, IU/L | 26.8 (10.3) | 27.7 (9.7) | 0.615 |
| Alanine aminotransferase, IU/L | 21.5 (13.3) | 23.7 (15.3) | 0.411 |
| Blood urea nitrogen, mg/dL | 16.4 (4.6) | 16.1 (3.8) | 0.740 |
| Serum creatinine, mg/dL | 0.8 (0.2) | 0.8 (0.2) | 0.424 |
| Uric acid, mg/dL | 5.7 (1.3) | 5.7 (1.1) | 0.916 |
| Haemoglobin A1c, % | 5.4 (0.6) | 5.3 (0.6) | 0.759 |
| Total cholesterol, mg/dL | 183.0 (33.3) | 184.8 (29.4) | 0.757 |
| Triglyceride, mg/dL | 99.4 (58.6) | 104.6 (41.6) | 0.585 |
| High density lipoprotein-cholesterol, mg/dL | 54.5 (13.0) | 55.8 (13.1) | 0.593 |
| Low density lipoprotein-cholesterol, mg/dL | 112.9 (31.9) | 115.2 (27.0) | 0.676 |
| Adiponectin, µg/mL | 9.8 (5.7) | 9.4 (5.8) | 0.725 |
| B-type natriuretic peptide, pg/mL | 73.6 (98.9) | 37.5 (27.9) | 0.366 |
| Plasma renin activity, ng/[mL h] | 2.9 (6.0) | 2.4 (3.3) | 0.580 |
| Angiotensin converting enzyme, U/L | 15.6 (7.3) | 15.7 (5.9) | 0.929 |
| Homocysteine, µM | 14.9 (6.6) | 13.8 (3.7) | 0.249 |
| D-Dimer, µg/mL | 0.9 (0.7) | 0.7 (0.3) | 0.052 |
| Fibrinogen, mg/dL | 359.0 (92.9) | 357.7 (69.1) | 0.932 |
| Serum amylase, U/L | 119.2 (43.1) | 124.9 (35.5) | 0.436 |
| Anti-nuclear antibody index | 15.0 (9.3) | 14.7 (8.0) | 0.845 |
Among the 117 elderly smokers, homocysteine data was not available for one subject. One subject in the non-resistant group and no subjects in the resistant group were receiving anti-anaemia therapy (chi-square test: P = 0.246). One subject in the non-resistant group and two subjects in the resistant group were receiving respiratory medications (chi-square test: P = 0.585). Information on diagnoses and medications was not available. Data are mean values (SD). The ‘cigarette smoke resistant’ population is defined in Methods.