Table 3. Factors influencing the bias of assessed testing methods, as evaluated by univariate and multiple regressions.
| Univariate regression | ||||||
| HemoCue® wicking method | HemoCue® gravity method | Pronto® device | ||||
| Variable | coefficient of variation | 95% CI | coefficient of variation | 95% CI | coefficient of variation | 95% CI |
| Sysmex KN21TM | -0.21* | -0.38, -0.05 | 0.01 | -0.10, 0.11 | -0.67* | -0.80, -0.54 |
| MUAC | -0.09 | -0.22, 0.03 | 0.02 | -0.06, 0.11 | -0.01 | -0.14, 0.11 |
| Childage | 0.00 | -0.01, 0.02 | 0.01 | 0.00, 0.02 | 0.00 | -0.02. 0.01 |
| Childage2 | 0.00 | 0.00, 0.00 | 0.00 | 0.00. 0.00 | 0.00 | 0.00. 0.00 |
| HAZ | 0.01 | -0.12, 0.13 | -0.02 | -0.12, 0.08 | 0.03 | -0.10, 0.15 |
| WHZ | -0.11 | -0.24, 0.02 | -0.02 | -0.10, 0.07 | 0.03 | -0.09, 0.15 |
| Skin pigmentation | — | — | — | — | -0.22* | -0.39, -0.05 |
| SpO2 | — | — | — | — | -0.02 | -0.15, 0.11 |
| Pulse rate | — | — | — | — | 0.00 | -0.01, 0.01 |
| Perfusion index | — | — | — | — | 0.01 | -0.09, 0.12 |
| Multiple regression | ||||||
| HemoCue® wicking method | HemoCue® gravity method | Pronto® device | ||||
| Variable | coefficient of variation | 95% CI | coefficient of variation | 95% CI | coefficient of variation | 95% CI |
| Sysmex KN21TM | -0.24* | -0.43, -0.05 | 0.01 | -0.09, 0.11 | -0.66* | -0.79, -0.52 |
| MUAC | -0.07 | -0.33, 0.20 | -0.02 | -0.12, 0.08 | 0.01 | -0.15, 0.18 |
| Child age | 0.01 | -0.06, 0.08 | 0.02 | -0.03, 0.06 | 0.03 | -0.02, 0.08 |
| Child age2 | 0.00 | 0.00, 0.00 | 0.00 | 0.00, 0.00 | 0.00 | 0.00. 0.00 |
| HAZ | 0.04 | -0.14, 0.23 | -0.02 | -0.13, 0.09 | 0.01 | -0.11, 0.12 |
| WHZ | -0.09 | -0.28, 0.11 | 0.01 | -0.10, 0.12 | -0.01 | -0.15, 0.13 |
| Skin pigmentation | — | — | — | — | -0.14 | -0.29, 0.00 |
| SpO2 | — | — | — | — | 0.02 | -0.08, 0.11 |
| Pulse rate | — | — | — | — | 0.00 | -0.01, 0.01 |
| Perfusion index | — | — | — | — | 0.00 | -0.07, 0.08 |
*p<0.05