Table 4.

Age-related serum IgA levels in healthy children (mg/dL).

Age group	Number	Geometric mean ± SD	Mean ± SD	Min–max	95% confidence interval
0–30 days	30	6.77 ± 0.45	6.79 ± 0.45	6.67–8.75	6.62–6.95
1–3 months	30	9.58 ± 5.16	10.53 ± 5.16	6.67–24.6	8.57–12.49
4–6 months	30	17.23 ± 9.77	19.86 ± 9.77	6.67–53	14.70–25.01
7–12 months	30	23.63 ± 12.37	29.41 ± 12.37	6.68–114	21.06–37.77
13–24 months	30	34.09 ± 17.1	37.62 ± 17.1	13.1–103	31.34– 47.85
25–36 months	30	48.87 ± 24.52	59.77 ± 24.52	6.67–135	46.05–71.38
3–5 years	30	62.75 ± 34.05	68.98 ± 34.05	35.7–192	56.27–81.7
6–8 years	30	97.38 ± 49.66	106.9 ± 49.66	44.8–276	88.36–125.45
9–11 years	30	102.27 ± 47.05	115.99 ± 47.05	32.6–262	94.69–137.29
12–16 years	30	112.16 ± 47.51	120.90 ± 47.51	36.4–305	99.29–172.11
16–18 years	30	179.21 ± 89.92	201.84 ± 89.92	46.3–385	168.26– 235.41
Total	330	41.04 ± 32.13	70.78 ± 32.13	6.67–385	64.07–80.54

IgA: Immunoglobulin A