Table 2. Mean percentages of thymic and central naive T-cell subtypes during the first year of life according to gender (n=62 males, n=68 females).

	Birth		6 months		12 months		Overall (longitudinal)a
	Male	Female	Male	Female	Male	Female	Male	Female
As % of CD4+ T cells
CD31+ thymic naive	74.9	77.3	72.1	74.1	66.6	67.6	−1.8 (95% CI, −3.4, 0.3)
P-value	0.018		0.024		0.37		0.021
CD31− central naive	18.5	16.3	12.4	9.5	12.5	10.1	2.6 (95% CI, 1.4, 3.7)
P-value	0.011		<0.001		<0.001		<0.001
Thymic/central naive ratio	4.6:1	5.2:1	6.5:1	8.7:1	6.0:1	7.7:1	−1.2 (95% CI, −1.9, 0.5)
P-value	0.056		<0.001		0.001		0.002

Abbreviation: CI, confidence interval.

^aMean difference (male to female).