Table 2. Correlations for individual cytokine responses to various mycobacterial antigens and PHA in BCG vaccinated infants.

	IFN-γ PHA			IFN-γ PPD			IFN-γ Ag85			IFN-γ STCF			IFN-γ KMTB
	Na	ρb	p valuec	N	ρb	p value	N	ρb	p value	N	ρb	p value	N	ρb	p value
IFN-γ PHA	-	-	-	188	0.176	0.0156	171	0.466	1.37×10−10	166	0.0629	0.421	188	0.089	0.224
IFN-γ PPD				-	-	-	200	0.540	1.5×10−16	207	0.675	7.38×10−29	229	0.543	5.79×10−19
IFN-γ Ag85							-	-	-	186	0.503	2.39×10−13	200	0.340	8.22×10−7
IFN-γ STCF										-	-	-	209	0.615	3.57×10−23
IFN-γ KMTB													-	-	-

^aNumber of infants for whom both cytokine data were available for correlation analysis.

^bSpearman rank-order correlation coefficient.

ρ values>0.3 with corresponding p values≤0.05 are shown in bold.

IFN-γ: interferon-gamma; IL-13: interleukin-13; IL-5: interleukin-5; PHA: phytohaemagglutinin; PPD: purified protein derivative; Ag85: antigen 85; STCF: short term culture filtrate; KMTB: killed Mycobacterium tuberculosis.