| Year | %CV Range | %CV Mean (SD) | % of Tests with %CV < 8% | Paired t-Test:Mean (SD) |
| Year 1n = 168 | 1.79 – 11.06 | 5.04 (1.74) | 93% | Year 1 and 2:0.68 (1.97),P = .003, n = 83 |
| Year 2n = 89 | 1.73 – 10.23 | 4.25 (1.58) | 99% | Year 2 and 3:0.27 (2.53),P = .58, n = 28 |
| Year 3n = 28 | 0.65 – 13.28 | 4.01 (2.24) | 96% | Year 1 and 3:0.82 (2.28),P = .093, n = 24 |