Table 4. Precision for the starch analysis expressed as coefficient of variation (C.V.).
| Mean SC/g/100 g | C.V./% | V.R. | |
| Sample | 3.066 | 3.7 | 1.19 |
| Organ | |||
| Twig | 1.610 | 2.5 | 0.15†† |
| Mature | 1.659 | 8.1 | 1.69 |
| Root | 5.930 | 2.3 | 1.73 |
| Species*Organ | |||
| Acer | 9.834 | 1.7 | 2.78* |
| Twig | 4.879 | 0.8 | 0.20 |
| Mature | 4.997 | 2.3 | 1.81 |
| Root | 19.63 | 1.1 | 6.31** |
| Magnolia | 0.839 | 5.9 | 0.23† |
| Twig | 1.004 | 5.0 | 0.36 |
| Mature | 0.799 | 5.8 | 0.31 |
| Root | 0.715 | 2.2 | 0.03† |
| Cedrus | 0.157 | 83 | 1.67 |
| Twig | −0.009 | - | 0.04† |
| Mature | 0.437 | 41 | 4.51* |
| Root | 0.042 | 133 | 0.45 |
| Pinus | 1.435 | 2.2 | 0.09†† |
| Twig | 0.565 | 2.1 | 0.04† |
| Mature | 0.402 | 7.9 | 0.29 |
| Root | 3.338 | 0.9 | 0.23 |
To compare precision, the variance for the sample was divided by the variance for the internal reference. In an F-test the variance ratio (V.R.) was significantly higher than unity (lower precision for sample) at p<0.05 (*), p<0.01 (**) or significantly lower than unity (higher precision for sample) at p>0.95 (†), p>0.99 (††). Sample averages all samples. Twig, Mature and Root average the 4 species. Acer, Magnolia, Cedrus and Pinus average the three organs. n = 3.