Model | Validation dataseta |
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Val1 (n = 39) | Val2 (n = 35) | Val3 (n = 33) |
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\({r^{2}}_{{\text{p}}}\) | RMSEP (µg Hb/mg faeces) | %SN (95% CI) | %SP (95% CI) | \({r^{2}}_{{\text{p}}}\) | RMSEP (µg Hb/mg faeces) | %SN (95% CI) | %SP (95% CI) | \({r^{2}}_{{\text{p}}}\) | RMSEP (µg Hb/mg faeces) | %SN (95% CI) | %SP (95% CI) |
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1 | 0.05 | 2.78 | 71.4% (47.8–88.7%) | 44.4% (21.5–69.2%) | 0.73 | 1.57 | 88.2% (63.6–98.5%) | 72.2% (46.5–90.3%) | 0.77 | 1.67 | 88.9% (65.3–98.6%) | 64.3% (35.1–87.2%) |
2 | NA | 3.03 | 57.1% (34.0–78.2%) | 66.7% (41.0–86.7%) | 0.68 | 1.73 | 82.4% (56.6–96.2%) | 77.8% (52.4–93.6%) | 0.76 | 1.73 | 94.4% (72.7–99.9%) | 78.6% (49.2–95.3%) |
- \({r^{2}}_{{\text{p}}}\), Coefficient of determination for correlation of prediction; RMSEP, root-mean-squared error of prediction (units in µg Hb/mg faeces); %SN (95% CI): sensitivity of the model with a 95% confidence interval; %SP (95% CI), specificity of the model with a 95% CI
- aTo include variations that may be present in future validations, a randomly selected portion of faecal samples included in Models 1 and 2 were mixed with various concentrations of haemoglobin and scanned as a slab on separate days using the visual–near-infrared spectrometer (Val1 and Val2). Faecal samples were collected from the Lower North and Yorke Peninsula in South Australia to represent locations not included in the models as validation dataset 3 (Val3)