Table 3.

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

Age group	Number	Geometric mean ± SD	Mean ± SD	Min–max	95% confidence interval
0–30 days	30	913.85 ± 262.19	953 ± 262.19	399–1480	855.1–1050.9
1–3 months	30	409.86 ± 145.59	429.5 ± 145.59	217–981	375.14–483.86
4–6 months	30	440.17 ± 236.8	482.43 ± 236.8	270–1110	394.01–570.86
7–12 months	30	536.79 ± 186.62	568.97 ± 186.62	242–977	499.28–638.65
13–24 months	30	726.79 ± 238.61	761.7 ± 238.61	389–1260	672.6–850.8
25–36 months	30	786.41 ± 249.14	811.5 ± 249.14	486–1970	718.47–904.53
3–5 years	30	823.19 ± 164.19	839.87 ± 164.19	457–1120	778.56–901.18
6–8 years	30	982.86 ± 255.53	1014.93 ± 255.53	483–1580	919.52–1110.35
9–11 years	30	1016.12 ± 322.27	1055.43 ± 322.27	642–2290	935.09–1175.77
12–16 years	30	1123.56 ± 203.83	1142.07 ± 203.83	636–1610	1065.96–1218.18
16–18 years	30	1277.20 ± 361.89	1322.77 ± 361.89	688–2430	1187.63–1457.9
Total	330	773.94 ± 361.76	852.92 ± 361.76	217–2430	813.75–892.1

IgG: Immunoglobulin G