Table E1.

Sensitivities of the assay (in pg/mL) (www.millipore.com)

Cytokine	Lowest detectable concentration	No. of samples below the detection limit
IL-1β	0.19	22 of 47
IL-2	0.38	8 of 48
IL-4	2.87	7 of 48
IL-5	0.12	3 of 47
IL-6	0.79	0 of 47
IL-7	0.42	4 of 48
IL-8	0.32	0 of 48
IL-10	0.41	0 of 48
IL-12	0.23	6 of 48
IL-13	4.06	12 of 48
IFN-γ	0.55	6 of 48
GM-CSF	0.23	3 of 48
TNF-α	0.22	0 of 48