Table 2. Total serum IgE levels in children aged 6–7 years.

Characteristics	No.	Geometric mean	25th	Median	75th	90th	95th	P value
Overall	3,753	89.0	28.5	86.7	292.6	698.5	1,200.7
Gender								< 0.001
Male	1,892	112.6	36.2	123.3	368.8	784.0	1252.2
Female	1,861	70.1	23.4	63.6	208.8	594.9	1099.3
Atopy*								< 0.001
Yes	1,539	220.5	85.5	246.5	586.8	1247.0	1871.1
No	2,214	47.4	17.9	44.7	124.9	308.8	509.7
Diagnosis of allergic diseases, ever								< 0.001
Yes	2,208	106.2	32.8	108.3	351.7	820.4	1480.4
No	1,545	69.2	24.3	63.3	210.5	506.7	876.7
Symptom of allergic diseases, within the last 12 months								< 0.001
Yes	2,048	121.7	36.0	127.2	386.7	853.0	1485.9
No	1,698	56.4	23.2	59.9	184.4	457.3	851.1
Treatment for allergic diseases, within the last 12 months								< 0.001
Yes	1,468	126.9	36.0	129.7	402.4	913.6	1697.6
No	2,284	65.3	25.8	69.4	220.3	559.9	925.2

IgE = immunoglobulin E, SPT = skin prick test.

^*Defined as at least a positive SPT response.