Table 1.
Characteristics of Participants Included in Analysis (n = 2380)
| Characteristic | Included in the Analysis (n = 2380) |
|---|---|
| Child Gender, n (%) | |
| Female | 1127 (47.4) |
| Male | 1253 (52.6) |
| Child zBMI, mean (SD) | 0.23 (1.1) |
| Missing, n (%) | 23 (1.0) |
| Maternal age at child’s birth (Years), mean (SD) | 33.1 (4.8) |
| Missing, n (%) | 129 (5.4) |
| Maternal education level, n (%) | |
| College/University | 2092 (87.9) |
| High school | 240 (10.0) |
| Public school | 26 (1.1) |
| Missing | 22 (0.9) |
| Received antibiotic for URTI prior to 2 years old, n (%) | |
| Yes | 653 (27.4) |
| No | 1727 (72.6) |
| Received antibiotic for AOM prior to 2 years old, n (%) | |
| Yes | 526 (22.1) |
| No | 1854 (77.9) |
| Number of URTI visits from birth to age 2, mean (SD) | 2.0 (2.6) |
| Number of URTI visits from age 2 to last visit | 2.4 (3.2) |
| Antibiotics for URTI from age 2 to last visit | 0.7 (1.3) |
| Median neighborhood household income ($CAD), mean (SD) | 60,312 (26,984) |
| Missing, n (%) | 168 (7.1) |
| No. of Siblings, n (%) | |
| 0 | 832 (35.0) |
| 1 | 1095 (46.0) |
| 2 | 309 (13.0) |
| 3+ | 78 (3.3) |
| Missing | 66 (3.7) |
| Maternal ethnicity, n (%) | |
| European | 1706 (71.7) |
| East Asian | 271 (11.4) |
| South Asian/ Southeast Asian | 179 (7.5) |
| Other | 98 (4.1) |
| Missing | 126 (5.3) |
| Practice type | |
| Pediatric practice | 2291 (96.2%) |
| Family practice | 89 (3.7%) |
| Child in licensed daycare, n (%) | |
| Yes | 1165 (48.9) |
| No | 1146 (48.1) |
| Missing | 69 (2.9) |
| Child age at first visit (months), mean (SD) | 37.4 (15.7) |
| Observation time (days), mean (SD) | 1684 (761) |
Abbreviations: zBMI, standardized body mass index; GEE, Generalized Estimating Equation; URTI, upper respiratory tract infection; SD, standard deviation; AOM, acute otitis media.