Table 1 Participant initial visit characteristics

Timing of introduction to infant cereal (mo)

4.1 (0.2)

6.0 (0.1)

5.7 (1.9)

Age at first visit (yr)

2.4 (2.4)

3.1 (2.4)

2.7 (2.4)

Child diagnosed with eczema or atopic dermatitis

 ● Yes

185 (13.3)

435 (13.3)

1043 (13.3)

 ● No

1108 (79.9)

2608 (79.8)

6247 (79.7)

Child had wheezing

 ● Yes

207 (14.9)

517 (15.8)

1188 (15.1)

 ● No

1159 (83.6)

2698 (82.6)

6517 (83.1)

Sex

 ● Male

743 (53.6)

1706 (52.2)

4100 (52.3)

 ● Female

641 (46.2)

1557 (47.6)

3727 (47.5)

Birth weight (kg)

3.3 (0.6)

3.3 (0.6)

3.3 (0.6)

Gestational Age

 ● 32–36 weeks

115 (8.3)

337 (10.3)

746 (9.5)

 ● 37 weeks

1125 (81.2)

2492 (76.3)

6091 (77.7)

Breastfeeding duration

 ● < 4mo

292 (21.1)

363 (11.1)

1191 (15.2)

 ● ≥ 4mo

1056 (76.2)

2798 (85.6)

6397 (81.6)

Season of birth

 ● Fall

372 (26.8)

792 (24.2)

1999 (25.5)

 ● Spring

349 (25.2)

839 (25.7)

1963 (25.0)

 ● Summer

350 (25.3)

864 (26.4)

2048 (26.1)

 ● Winter

315 (22.7)

773 (23.7)

1826 (23.3)

Familial Characteristics

 Number of siblings

0.8 (0.9)

0.9 (0.8)

0.9 (0.8)

 Median

1.0

1.0

1.0

Household Cigarette Smoker

 ● Yes

182 (13.1)

302 (9.2)

883 (11.3)

 ● No

1191 (85.9)

2926 (89.5)

6857 (87.4)

Family History of Asthma (Mother, Father, or Sibling)

 ● Yes

233 (16.8)

542 (16.6)

1286 (16.4)

 ● No

963 (69.5)

2318 (70.9)

5506 (70.2)

Maternal Ethnicity

 ● European

825 (59.5)

1900 (58.1)

4430 (56.5)

 ● Asian^b

220 (15.9)

597 (18.3)

1418 (18.1)

 ● African

80 (5.8)

146 (4.5)

413 (5.3)

 ● Latin American

35 (2.5)

99 (3.0)

218 (2.8)

 ● Other (mixed, Arab)

109 (7.9)

241 (7.4)

633 (8.1)

Median after tax household income (CAD $)

 ● 29,999

92 (6.6)

203 (6.2)

545 (6.9)

 ● 30,000–79,999

256 (18.5)

519 (15.9)

1365 (17.4)

 ● 80,000–149,999

442 (31.9)

1004 (30.7)

2396 (30.5)

 ● 150,000

547 (39.5)

1421 (43.5)

3222 (41.1)