Table 3a and 3b.

Distribution of TSLP by year for entire sample (3a) and subset of the sample including only participants with TSLP measurements at all 3 years (3b).

Year	N	< LOD (10 pg/ml) % (n)	≥ LOD Mean ± std (pg/ml)
1	352	67% (236)	57.6 ± 68.2
2	275	64% (177)	46.6 ± 35.3
3	259	72% (186)	47.3 ± 50.9

Year	N	< LOD (10 pg/ml) % (n)	≥ LOD Mean ± std (pg/ml)
1	236	67% (159)	54.9 ± 64.6
2	236	64% (150)	48.2 ± 35.6
3	236	71% (167)	48.0 ± 52.2

Cochran-Mantel-Haenszel test for difference across years: 2.78, p=0.25

LOD, limit of detection