Table 1– IgE levels across demographic variables, asthma status, atopic status, airways inflammation and socioeconomic variables, stratified by study site; Peru, 2009–2010

Characteristic	Total serum IgE kU·L⁻¹
	Lima^#			Tumbes^¶
	Geometric mean	Mean±sd	p-value	Geometric mean	Mean±sd	p-value
Overall	262	588±883		192	407±679
Demographics
Sex
Male	326	692±962		204	416±725
Female	210	484±784	<0.001	178	397±623	0.20
Body mass index >25 kg·m⁻²
No	240	566±921		189	396±652
Yes	432	712±630	<0.001	235	549±951	0.28
Asthma and atopy
Asthma status
No	238	546±891		188	397±666
Yes	516	894±760	<0.001	338	743±1006	0.12
Atopy status
No	182	440±745		147	355±773
Yes	351	716±992	<0.001	294	479±463	<0.001
Asthma phenotype
Atopic	761	1080±794		472	662±438
Non-atopic	136	302±290	<0.01	251	816±1358 (Median=119)	0.38
Exhaled nitric oxide >40 ppm
No	217	478±764		172	367±666
Yes	1142	1404±877	<0.001	611	838±709	<0.001
Socioeconomic indicators
Maternal education ≥6 years
No	308	589±680		182	380±507
Yes	249	590±943	0.11	194	419±747	0.60
Income <175 USD per month
No	274	616±946		189	429±672
Yes	229	509±668	0.17	193	394±685	0.85
6+ people per house
No	255	595±925		185	400±731
Yes	268	581±841	0.68	212	428±519	0.26
Concrete floor
No	255	537±691		216	485±876
Yes	273	673±1132	0.59	175	347±468	0.05
Pets in household
Dogs
No	279	571±834		201	433±629
Yes	249	601±920	0.32	188	397±698	0.56
Cats
No	267	632±978		192	413±730
Yes	255	535±750	0.69	191	399±607	0.98
Chickens
No	250	552±771		175	345±487
Yes	311	728±1214	0.12	203	446±775	0.16
Ducks
No	257	581±886		191	385±528
Yes	324	665±848	0.23	192	434±828	0.97
Turkeys
No	262	590±886		190	413±714
Yes	177	353±244	0.71	204	374±413	0.61
Doves
No	257	564±808		190	412±701
Yes	287	719±1205	0.50	204	370±444	0.65
Guinea pigs
No	261	582±830		191	411±691
Yes	266	639±1224	0.91	196	352±441	0.90

^#: n= 566; ^¶: n=577.