Main Characteristics of Overall Study Population and of 2 Subgroups in Which Additional Rest SPECT Was Recorded in Sitting or Supine Position
| Characteristic | Overall study population (n = 80) | Sitting subgroup (n = 40) | Supine subgroup (n = 40) |
| Age (y) | 62 ± 10 | 64 ± 12 | 59 ± 8* |
| Female sex | 15 (19) | 4 (10) | 11 (27)* |
| Body mass index (kg⋅m−2) | 29 ± 5 | 28 ± 5 | 29 ± 5 |
| >30 kg⋅m−2 | 24 (30) | 12 (30) | 12 (30) |
| History of myocardial infarction | 27 (34) | 17 (42) | 10 (25) |
| History of coronary artery bypass | 9 (11) | 6 (15) | 3 (7) |
| History of coronary angioplasty | 33 (41) | 21 (52) | 12 (30) |
| Recent history of chest pain | 32 (40) | 17 (42) | 15 (38) |
| Exercise stress test | 70 (87) | 33 (82) | 37 (92) |
| Pharmacologic stress test | 10 (12) | 7 (17) | 3 (7) |
| Segments with stress defects | 2.5 ± 2.7 | 3.0 ± 2.9 | 2.0 ± 2.4 |
↵* P < 0.05 for paired comparisons between sitting and supine subgroups.
Qualitative data are expressed as numbers, followed by percentages in parentheses; continuous data are expressed as mean ± SD.