Comparison of average OD values by kit type for EPs 1–4 (mixed effects model estimates).

Comparison of average OD values by kit type for EPs 1–4 (mixed effects model estimates).</p

Data summary of laboratories by kit type for EPs 1–4.

Data summary of laboratories by kit type for EPs 1–4.</p

Comparison of between-site and within-site variances of OD and ODn values for EPs 1–4 (mixed effects models estimates).

Comparison of between-site and within-site variances of OD and ODn values for EPs 1–4 (mixed effects models estimates).</p

Mean ODn values for each sample by site and kit type.

Maxim kits are shown in green and Sedia kits are in purple. Eight out of nine samples had significantly higher Sedia means than Maxim means.</p

Proficiency criteria and average scores.

Proficiency criteria and average scores.</p

Between-site and within-site variances for kit calibrators, EPs 1–4 (mixed effects model estimates).

Between-site and within-site variances for kit calibrators, EPs 1–4 (mixed effects model estimates).</p

Comparison of Maxim and Sedia OD and ODn values.

Panel A shows OD readings and Panel B shows ODn readings. The blue line is the linear regression line and the red line shows the slope if the two kits had produced equivalent results.</p

Comparison of average ODn values by kit type for EPs 1–4 (mixed effects model estimates).

Comparison of average ODn values by kit type for EPs 1–4 (mixed effects model estimates).</p