Table 5.

Diameter of IDT injection wheal (Wi) after injecting 0.02 ml saline and amoxicillin (20 mg/ml) using standardized method for drug intradermal tests.

	Porto	Vilnius	Ankara	Firenze	Nancy	Malaga	Graz	Groningen	Total
Saline number tested	26	87	78	118	734	6	24	23	1,096
Age	10	51	48	46	59	28	28	44	43
Site
UA	0	0	0	0	409	0	8	0	417
FA	26	87	78	118	133	6	8	23	479
Back					192		8		200
Median Wi diameter (R) mm	5 (4–6)	5 (3–10)	5 (4–6)	5 (3–6)	5 (2–7)	5 (4–6)	5.4 (4–7)	4.5 (3–6)	Wi diameter Median 5 mm Range (2–10) Q1 = 5, Q3 = 5, IQR = 0, **p < 0.0001
Amoxicillin number tested	3	23	0	86	88	17	0	23	240
Age	5	51		45	53	35		44	48
Site
UA	0	0	0	0	88	0	0	0	88
FA	3	23	0	86	0	17	0	23	152
Median Wi diameter (R) mm by center	5 (5–6)	6 (4–9)		5 (3–6)	5 (2–7)	6.4 (4–7)		5 (4–7)	Wi diameter Median 5 mm Range (2–9) Q1 = 4.5, Q3 = 5, IQR = 0.5, **p < 0.0001

R, range minimal and maximal; IQR, interquanrile range; Wi, injection wheal; UA, Upper Arm; FA, Forearm; B, Back.

^**The variables were subject to a chi-squared test for the qualitative variables and a Kruskal-Wallis test for the quantitative variables.