Table 1. Descriptive of the study population.

BiB: Born in Bradford study (UK). EDEN: Étude des Déterminants pré et postnatals du développement et de la santé de l’Enfant (France). KANC: Kaunus cohort (Lithuania). MoBa: Norwegian Mother, Father and Child Cohort Study (Norway). RHEA: Mother Child Cohort study (Greece). INMA: INfancia y Medio Ambiente cohort (Spain).

Variable	BiB	EDEN	KANC	MoBa	RHEA	INMA	All
N (%)	80 (9.7%)	80 (9.7%)	143 (17.4%)	188 (22.9%)	154 (18.7%)	178 (21.6%)	823 (100%)
Female (%)	36 (45%)	35 (43.8%)	64 (44.8%)	88 (46.8%)	69 (44.8%)	80 (44.9%)	372 (45.2%)
Male (%)	44 (55%)	45 (56.2%)	79 (55.2%)	100 (53.2%)	85 (55.2%)	98 (55.1%)	451 (54.8%)
Age, in years (IQR)	6.65 (6.44–6.84)	10.76 (10.37–11.22)	6.40 (6.12–6.88)	8.53 (8.17–8.83)	6.45 (6.36–6.62)	8.84 (8.44–9.21)	8.06 (6.49–8.86)
Natural Killer cells (IQR)	0.01 (0.00–0.03)	0.02 (0.00–0.04)	0.04 (0.01–0.07)	0.02 (0.00–0.07)	0.01 (0.00–0.03)	0.03 (0.01–0.05)	0.02 (0.00–0.05)
B-cell (IQR)	0.12 (0.11–0.15)	0.09 (0.07–0.11)	0.11 (0.09–0.13)	0.11 (0.09–0.14)	0.14 (0.11–0.16)	0.10 (0.08–0.13)	0.11 (0.09–0.14)
CD4+ T cell (IQR)	0.21 (0.18–0.25)	0.16 (0.14–0.20)	0.17 (0.14–0.21)	0.21 (0.17–0.25)	0.20 (0.16–0.26)	0.17 (0.14–0.21)	0.19 (0.15–0.23)
CD8+ T cell (IQR)	0.13 (0.11–0.17)	0.11 (0.08–0.13)	0.13 (0.10–0.16)	0.14 (0.11–0.17)	0.14 (0.11–0.16)	0.12 (0.09–0.14)	0.13 (0.10–0.16)
Monocytes (IQR)	0.09 (0.07–0.10)	0.09 (0.07–0.11)	0.08 (0.06–0.09)	0.08 (0.07–0.10)	0.09 (0.07–0.10)	0.09 (0.07–0.11)	0.08 (0.07–0.10)
Granulocytes (IQR)	0.41 (0.35–0.47)	0.52 (0.47–0.56)	0.46 (0.40–0.53)	0.41 (0.32–0.48)	0.41 (0.34–0.48)	0.48 (0.42–0.55)	0.44 (0.37–0.52)

Continuous variables are expressed as mean and interquartile range (IQR).