Table 2.
Comparison of mean CRP concentrations between different tube types stored at different temperatures. Concentrations of CRP are not significantly different between room temperature (RT) and 4°C incubated K2EDTA or P100 tubes at any time period (Panel A). Additionally, concentrations of CRP do not differ significantly between K2EDTA and P100 tubes whether stored at RT or 4°C (Panel B).
| PANEL A | PANEL B | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CRP | K2EDTA | P100 | RT | 4°C | |||||||||
| Comparison | 4 hrs incubation, RT vs 4°C | 24 hrs incubation, RT vs 4°C | 48 hrs incubation, RT vs 4°C | 4 hrs incubation, RT vs 4°C | 24 hrs incubation, RT vs 4°C | 48 hrs incubation, RT vs 4°C | baseline, K2EDTA vs P100 | 4 hrs incubation, K2EDTA vs P100 | 24 hrs incubation, K2EDTA vs P100 | 48 hrs incubation, K2EDTA vs P100 | 4 hrs incubation, K2EDTA vs P100 | 24 hrs incubation, K2EDTA vs P100 | 48 hrs incubation, K2EDTA vs P100 |
| Mean fold change (SEM) | 1.06 (0.04) | 0.99 (0.02) | 1.02 (0.02) | 1.01 (0.01) | 0.98 (0.04) | 0.98 (0.03) | 1.01 (0.04) | 1.05 (0.04) | 1.21 (0.2) | 0.93 (0.04) | 1.03 (0.03) | 0.98 (0.05) | 0.90 (0.06) |
| Mean difference (SEM) | 0.06 (0.04) | −0.02 (0.02) | 0.01 (0.02) | 0.00 (0.01) | −0.02 (0.05) | −0.01 (0.04) | 0.01 (0.03) | 0.03 (0.06) | 0.11 (0.13) | −0.10 (0.05) | 0.02 (0.02) | −0.02 (0.05) | −0.12 (0.07) |
| 95% CI of difference (lower, upper) | −0.05, 0.17 | −0.10, 0.06 | −0.06, 0.08 | −0.02, 0.02 | −0.15, 0.10 | −0.12, 0.09 | −0.08, 0.09 | −0.12, 0.17 | −0.27, 0.48 | −0.24, 0.04 | −0.05, 0.08 | −0.17, 0.13 | −0.32, 0.07 |
| Paired t (df) | 1.56 (4) | −0.77 (3) | 0.40 (4) | 0.53 (4) | −0.52 (5) | −0.35 (5) | 0.16 (5) | 0.47 (5) | 0.79 (4) | −2.06 (4) | 0.82 (3) | −0.32 (4) | −1.74 (4) |
| P | 0.19 | 0.50 | 0.71 | 0.63 | 0.62 | 0.74 | 0.88 | 0.66 | 0.48 | 0.11 | 0.47 | 0.77 | 0.16 |