Table 1.

Characteristics of the children who participated in the six-year follow-up survey.

Characteristics (n = 1202)			Number (%)/ mean (standard deviation)
Demographics
	Sex	Male	610 (50.8)
		Female	592 (49.3)
	Age (years old)		6.7 (0.2)
	Body weight (kg)		25.9 (5.8)
	Body weight
		25 kg or more	568 (47.3)
		less than 25 kg	634 (52.8)
	Body height (cm)		119.7 (5.9)
Perinatal information
	Mode of delivery
		Vaginal	688 (57.2)
		Caesarean section	514 (42.8)
	Birthweight (g)		3267.9 (411.5)
	Birthweight
		>=2500 g	1175 (97.8)
		<2500 g	27 (2.3)
	Gestational age at birth (weeks)		39.6 (1.2)
	Gestational age at birth
		>=37 weeks	1166 (97.0)
		<37 weeks	36 (3.0)
	Light-for-dates		129 (10.7)
Family history
	Mother’s age at child’s birth
		24 years or less	312 (26.0)
		25–34 years	728 (60.6)
		35 years or more	162 (13.5)
(n = 1201)	Maternal history of asthma and allergic diseases
		Yes	96 (8.0)
		No	1105 (92.0)
(n = 1201)	Maternal history of asthma
		Yes	12 (1.0)
		No	1189 (99.0)
(n = 1201)	Maternal history of atopic eczema
		Yes	13 (1.1)
		No	1188 (98.9)
(n = 1201)	Maternal history of rhinitis
		Yes	76 (6.3)
		No	1125 (93.7)
(n = 1191)	Paternal history of asthma and allergic diseases
		Yes	47 (4.0)
		No	1144 (96.1)
(n = 1191)	Paternal history of asthma
		Yes	9 (0.8)
		No	1182 (99.2)
(n = 1191)	Paternal history of atopic eczema
		Yes	5 (0.4)
		No	1186 (99.6)
(n = 1191)	Paternal history of rhinitis
		Yes	33 (2.8)
		No	1158 (97.2)
(n = 1201)	Maternal education level
		No or primary school	152 (12.7)
		Secondary school	403 (33.5)
		High school	399 (33.2)
		College or university	248 (20.6)
Environmental status
	Number of siblisngs
		0	276 (23.0)
		1	781 (65.0)
		2	112 (9.3)
		3+	33 (2.8)
	Vigorous physical activity
		Never or occasionally	1023 (85.1)
		Once or twice per week	130 (10.8)
		Three or more times a week	49 (4.1)
	Watch television
		Less than 1 hour	199 (16.6)
		1 hour but less than 3 hours	672 (55.9)
		3 hours but less than 5 hours	189 (15.7)
		5 hours or more	142 (11.8)
	Fuel for cooking
		Electricity	84 (7.0)
		Gas	1078 (89.7)
		Open fires	7 (0.6)
		Others	33 (2.8)
	Paracetamol use in the first 12 months of life
		Yes	1049 (87.3)
		No	153 (12.7)
	Paracetamol use in the past 12 months
		Never	267 (22.2)
		at least once a year	767 (63.8)
		at least once per month	168 (14.0)
	Antibiotics in the first 12 months
		Yes	876 (72.9)
		No	326 (27.1)
	Trucks pass through the street
		Never	512 (42.6)
		Seldom	324 (27.0)
		Frequently through the day	279 (23.2)
		Almost the whole day	87 (7.2)
	Breast feeding
		Yes	1.152 (95.8)
		No	50 (4.2)
	Cat or dog in home in the first year of life
		Yes	333 (27.7)
		No	869 (72.3)
	Cat or dog in home in the past 12 months
		Yes	335 (27.9)
		No	967 (72.1)
	Contact with farm animals in the first year of life
		Yes	77 (6.4)
		No	1125 (93.6)
	Mother regular contact with farm animals
		Yes	110 (9.2)
		No	1092 (90.9)
	Living in urban communes
		Yes	768 (63.9)
		No	434 (36.1)
	Mother smoke
		Yes	6 (0.5)
		No	1196 (99.5)
	Mother smoke during child’s first year of life
		Yes	7 (0.6)
		No	1195 (99.4)
	Father smoke
		Yes	629 (52.3)
		No	573 (47.7)
	Father smoke during mother’s pregnancy
		Yes	684 (56.9)
		No	518 (43.1)
	Smoker(s) in household
		Yes	685 (57.0)
		No	517 (43.0)