Annual incidence of hospital-acquired infections, Haematology Department, Edouard Herriot Hospital, Lyon (France) 2004–2010.

<p>Notes: AML, acute myeloid leukaemia; ALL, acute lymphoid leukaemia; 95%CI, 95% confidence interval.</p>a<p>number of diagnosed infection/100 patients;</p>b<p>number of diagnosed infection/1000 patient-days at risk.</p

Trajectory-groups.

<p>Trajectory-groups (with 95% confidence intervals) for viremia and changes in T-cell markers over time since contamination (in weeks). Viremia is expressed in log₁₀ of viral RNA copies per mL of plasma. The hatched area indicates the area below the virus detection threshold (1.9). Each T cell marker is expressed as the predicted value of log₁₀(<i>X</i>_w/<i>X</i>₀) where <i>X</i>₀ is the value at baseline and <i>X</i>_w the value at week <i>w</i> (1 to 12).</p

Criteria for the choice of the optimal number of trajectory-groups.

<p>Criteria for the choice of the optimal number of trajectory-groups.</p

Sex and age of cats by trajectory group for viremia and changes in T-cell markers.

<p>Sex and age of cats by trajectory group for viremia and changes in T-cell markers.</p

Number of infected cats according to the virus strain and the inoculum titre.

<p>Number of infected cats according to the virus strain and the inoculum titre.</p

Cross-tabulation of trajectory-groups according to viremia and changes in T-cell markers during the 12-week period after FIV inoculation.

a<p>The content of each cell is the number of cats among the 102 cats of the study.</p

Polychoric correlation coefficients between groups of inoculum and trajectory-groups of viremia and changes in T-cell markers during the 12-week period after virus inoculation.

<p>Significance:</p>†<p>p<0.01,</p>*<p>p<0.05,</p><p>Polychoric correlations are not correlations between quantitative variables but correlations between ordinal variables; here, the trajectory-groups. For example, CD4 and CD8 are viewed as ordinal variables, each with three categories. Using the cross-tabulation of CD8 by CD4 given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056135#pone-0056135-t004" target="_blank">Table 4</a>, a polychoric correlation of 0.88 means that cats that belong to group 3 for CD4 have a higher probability of belonging also to group 3 for CD8 than to the two other groups. Conversely, 0.08 means that cats that belong to group 3 for CD4 have a low probability of belonging to group 3 for CD4/CD8 ratio and could belong to any of the three groups for the CD4/CD8 ratio.</p

Aspect of the trajectories of viremia and changes in T-cell markers.

<p>Aspect of the trajectories of viremia and changes in T-cell markers.</p