Table 1 Detailed description of case study variables used during simulation and their distribution within the Barwon Infant Study
Variable | Variable Type | Label | n (%)* (N = 1074) | n (%) missing |
|---|---|---|---|---|
Outcome | ||||
Food Allergy at 1 year (present) | Binary; Present/Absent | foodallergy | 61 (7.8) | 288 (26.8) |
Exposure | ||||
Vitamin D Insufficiency at Birth (present) | Binary; Present/Absent | vdi | 149 (44.5) | 739 (68.8) |
Covariates | ||||
Ethnicity (Caucasian) | Binary; Caucasian/Not Caucasian | cauc | 772 (72.1) | 3 (0.3) |
Maternal Vitamin D Supplements Usage (present) | Binary; Present/Absent | antevd | 564 (78.8) | 358 (33.3) |
Family History of Allergy (present) | Binary; Present/Absent | hxfamall | 911 (86.1) | 16 (1.5) |
Number of Siblings | 3-Level Categorical | nsib | 0 (0.00) | |
None | 453 (42.2) | |||
One | 383 (35.7) | |||
Two or more | 238 (22.2) | |||
Family Pet Ownership (present) | Binary; Present/Absent | petown | 815 (80.5) | 62 (5.8) |
Formula Feeding at 6 months# | 3-Level Categorical | formfeed6 | 189 (17.6) | |
Exclusively Breast Fed | 429 (46.6) | |||
Exclusively Formula Fed | 320 (34.8) | |||
Mixed Feeding | 171 (18.6) | |||
Formula Feeding at 12 months# | 3-Level Categorical | formfeed12 | 154 (14.3) | |
Exclusively Breast Fed | 271 (30.6) | |||
Exclusively Formula Fed | 354 (40.0) | |||
Mixed Feeding | 260 (29.4) | |||
Auxiliary | ||||
Maternal Age at Birth | mage | 32.1 (4.78) | 3 (0.3) | |
Family SEIFA Classification | 3-Level Categorical | seifa | 20 (1.9) | |
Low | 268 (25.4) | |||
Middle | 204 (19.4) | |||
High | 582 (55.2) | |||