TABLE 1.
Frequency of procedures and details of their inconvenience units on payments made to research participants in the intramural program of the NIH Clinical Center from August 2004 to August 2008. Data collected by the NIH CRVP.
| PROCEDURE1 | OBSERVATIONS N (%) |
INCONVENIENCE UNITS Mean (± SD) Median (25th percentile, 75th percentile) Range (minimum-maximum) |
|---|---|---|
| Aphaeresis | 90 (0.25) | 8.06 ± 4.52 8.00 (4.00, 11.00) 2–20 |
| Biopsy2 | 65 (0.18) | 5.63 ± 1.61 5.00 (5.00, 8.00) 3–8 |
| Blood draw | 5,212 (14.37) | 2.25 ± 1.80 2.00 (1.00, 2.00) 0–21 |
| Dual energy x-ray absorptiometry scan (DEXA) | 291 (0.80) | 3.30 ± 2.19 2.00 (2.00, 6.00) 1–9 |
| Electrocardiography (EKG) | 1,156 (3.19) | 2.16 ± 2.01 1.00 (1.00, 4.00) 0–10 |
| Electroencephalogram (EEG) | 452 (1.25) | 5.35 ± 16.70 3.00 (2.00, 4.00) 0–128 |
| Electromyography (EMG) | 242 (0.67) | 3.37 ± 5.63 1.00 (1.00, 4.00) 0–39 |
| Functional magnetic resonance imaging scan (fMRI) | 204 (0.56) | 7.07 ± 3.47 10.00 (5.00, 10.00) 0–10 |
| History and physical | 3,098 (8.54) | 2.02 ± 2.10 1.00 (1.00, 2.00) 0–30 |
| Intravenous line (IV) | 1,976 (5.45) | 4.44 ± 2.59 4.00 (3.00, 5.00) 0–39 |
| Lumbar puncture (LP) | 48 (0.13) | 16.92 ± 19.49 5.00 (1.00, 29.00) 1–57 |
| Magnetic resonance imaging scan (MRI) | 9,434 (26.01) | 5.32 ± 3.69 5.00 (4.00, 5.00) 0–40 |
| Magnetoencephalogram (MEG) | 257 (0.71) | 3.72 ± 1.86 3.00 (3.00, 4.00) 0–8 |
| Positron emission tomography scan (PET) | 1,641 (4.52) | 10.41 ± 6.83 10.00 (5.00, 13.00) 1–65 |
| Psychological/cognitive testing | 3,883 (10.70) | 2.99 ± 2.11 3.00 (2.00, 3.00) 0–21 |
| Serial blood draw | 194 (0.53) | 4.85 ± 4.56 3.00 (2.00, 7.00) 1–40 |
| Structured clinical interview for DSM (SCID) | 385 (1.06) | 1.47 ± 0.59 1.00 (1.00, 2.00) 0–5 |
| 24 Hour urine collection | 224 (0.62) | 1.99 ± 1.35 2.00 (1.00, 2.00) 0–10 |
| Ultrasound | 116 (0.32) | 1.36 ± 0.75 1.00 (1.00, 2.00) 0–5 |
| Urinalysis | 873 (2.41) | 1.42 ± 0.92 1.00 (1.00, 2.00) 1–14 |
| Videofluoroscopy | 35 (0.10) | 7.17 ± 5.81 4.00 (4.00, 12.00) 2–21 |
1
Procedures were selected based on the following criteria: easily identifiable, used standard nomenclature, frequently used in clinical research studies, and had inconvenience units assigned for payment purposes. Medline Plus used for names of abbreviated procedures.
2
Does not include biopsies of major organs such as liver, kidney, etc.