Table 1.
Demographic and biochemistry data of patients with chronic obstructive pulmonary disease grouped by the patterns of oxygen pulse (n = 47*, mean ± SD).
| N= | Increasing (Inc) | Plateau (Plat) | Decreasing (Dec) | P | ||
|---|---|---|---|---|---|---|
| 16 | 20 | 9 | Inc vs Plat | Plat vs Dec | Inc vs Dec | |
| Age, years | 65.7 ± 6.3 | 65.3 ± 6.7 | 64.2 ± 2.3 | 0.98 | 0.89 | 0.82 |
| Height, cm | 164.6 ± 6.2 | 165.5 ± 7.2 | 164.4 ± 5.8 | 0.90 | 0.92 | 1.0 |
| Weight, kg | 67.2 ± 9.9 | 55.3 ± 8.3 | 60.3 ± 13.8 | 0.003 | 0.44 | 0.24 |
| Body mass index, kg/m2 | 24.8 ± 3.2 | 20.1 ± 2.0 | 22.2 ± 3.9 | <0.0001 | 0.20 | 0.09 |
| Smoke, pack·year | 46.6 ± 24.0 | 39.7 ± 11.6 | 40.7 ± 24.9 | 0.54 | 0.99 | 0.75 |
| Oxygen-cost diagram, cm. | 7.0 ± 1.7 | 7.1 ± 1.3 | 6.9 ± 1.1 | 0.98 | 0.96 | 0.99 |
| Triceps skin-fold thickness, mm | 7.6 ± 2.9 | 5.4 ± 1.8 | 6.1 ± 3.0 | 0.03 | 0.79 | 0.33 |
| Mid-arm circumference, cm | 28.1 ± 4.5 | 26.3 ± 2.2 | 28.0 ± 3.3 | 0.28 | 0.44 | 1.0 |
| Hemoglobin, gm | 15.0 ± 1.5 | 14.6 ± 1.7 | 15.1 ± 1.0 | 0.68 | 0.76 | 1.0 |
| Carboxy-hemoglobin, % | 1.3 ± 1.1 | 1.5 ± 0.8 | 1.1 ± 0.6 | 0.75 | 0.50 | 0.88 |
| Albumin, g/dL | 4.2 ± 0.4 | 4.1 ± 0.4 | 4.2 ± 0.3 | 0.48 | 0.72 | 0.98 |
| Creatinine, mg/dL | 1.1 ± 0.2 | 1.0 ± 0.1 | 1.2 ± 0.2 | 0.79 | 0.05 | 0.17 |
*2 patients excluded from the analysis due to poor exercise performance. Bolded numbers indicating statistical significance or the largest number of each variable across the three groups.