Table 3.
Median injection wheal (Wi) diameter for intradermal tests with saline using non-standardized individual protocols, demonstrating large inter-center variations.
| Center | Porto | Vilnius | Ankara | Paris (Necker) | Firenze | Nancy | Munich | Total |
|---|---|---|---|---|---|---|---|---|
| Mean age (yrs.) | 8 | 47 | 43 | 9 | 45 | 55 | 32 | 42 |
| Site | ||||||||
| UA (n) | 15 | 9 | 24 | 24 | 72 | |||
| FA (n) | 6 | 32 | 11 | 99 | 22 | 24 | 194 | |
| B (n) | 28 | 24 | 52 | |||||
| Injected volume | ||||||||
| 0.02 ml (n) | 3 | 36 | 39 | |||||
| 0.03 ml (n) | 6 | 22 | 48 | 9 | 99 | 46 | 36 | 266 |
| 0.04–0.05 ml (n) | 10 | 3 | 13 | |||||
| Total (n) | 6 | 32 | 54 | 9 | 99 | 46 | 72 | 318 |
| Median Wi diameter (R) mm by center | 6 (5–8) | 5 (3–11) | 3 (2–4) | 8 (7–9) | 5 (4–6) | 5 (3–7) | 4.5 (3–7) | Wi diameter Median 5 mm Range (2–11) IQR 4–5 **p < 0.0001 |
UA, Upper Arm; FA, Forearm; B, Back; n, number of tests; R, range minimal and maximal; IQR, interquartile range.
**
The variables were subject to a chi-squared test for the qualitative variables, a Kruskal-Wallis test for the quantitative variables.