Variability of anti-human transglutaminase testing in celiac disease across Mediterranean countries

Figure 1 Mean observed results with the relative interquartile ranges. The arrows indicate the expected values.

Figure 2 Means of log-transformed observed results stratified according to the expected values, which are indicated by an arrow.

Figure 3 Mean percent variation [(Vo - Vr/Vr) × 100] distribution; green lines indicate the mean and normal distribution.

Figure 4 Mean accuracy (Vo - Vr) stratified according to centre, logarithmic scale.

Figure 5 Mean percent variation ([(Vo - Vr)/Vr] × 100) stratified according to centre, logarithmic scale.

Figure 6 Mean accuracy (Vo - Vr) stratified according to the expected values, logarithmic results.

Figure 7 Mean Percent Variation ([(Vo - Vr)/Vr] × 100) stratified according to the expected values, logarithmic results.

Figure 8 Mean coefficient of Variation (σ/μ) stratified according to the expected values, logarithmic scale.