TABLE 1.
Conditional logistic results for initial and recurrent otitis media
| Cohort, % |
Initial otitis media, OR (95% CI) |
Recurrent otitis media, OR (95% CI) |
|||
|---|---|---|---|---|---|
| Univariate | Multivariate* | Univariate | Multivariate* | ||
| Total | 100 | ||||
| Sex | |||||
| Male | 51.5 | 1.24 (1.20–1.28) | 1.23 (1.19–1.27) | 1.34 (1.26–1.43) | 1.32 (1.24–1.41) |
| Female | 48.5 | Reference | Reference | Reference | Reference |
| Older siblings | |||||
| Yes | 53.9 | 1.14 (1.10–1.18) | 1.18 (1.14–1.22) | 1.28 (1.20–1.36) | 1.32 (1.23–1.41) |
| No | 46.1 | Reference | Reference | Reference | Reference |
| Maternal smoking during pregnancy | |||||
| Yes | 10.4 | 1.24 (1.17–1.31) | 1.16 (1.09–1.23) | 1.17 (1.07–1.29) | 1.09 (0.98–1.20) |
| No | 89.6 | Reference | Reference | Reference | Reference |
| Initiation of breastfeeding | |||||
| No | 8.7 | 0.87 (0.81–0.92) | 0.83 (0.78–0.89) | 1.04 (0.93–1.16) | 0.97 (0.87–1.09) |
| Yes | 91.3 | Reference | Reference | Reference | Reference |
| Aboriginal status | |||||
| Yes | 2.4 | 1.71 (1.52–1.92) | 1.47 (1.30–1.65) | 1.70 (1.43–2.02) | 1.45 (1.21–1.73) |
| No | 97.6 | Reference | Reference | Reference | Reference |
| Birth weight, g | |||||
| >4000 | 13.5 | 1.23 (1.17–1.30) | 1.18 (1.12–1.24) | 1.24 (1.14–1.36) | 1.16 (1.07–1.27) |
| 2500–4000 | 81.7 | Reference | Reference | Reference | Reference |
| <2500 | 4.8 | 0.89 (0.82–0.97) | 0.95 (0.88–1.03) | 1.05 (0.91–1.22) | 1.10 (0.95–1.28) |
| Gestational age, weeks | |||||
| >41 | 1.6 | 0.98 (0.85–1.12) | 0.82 (0.63–1.08) | ||
| 37–41 | 90.5 | Reference | Reference | ||
| 30–36 | 6.3 | 0.99 (0.93–1.06) | 1.15 (1.02–1.29) | ||
| <30 | 0.4 | 1.07 (0.87–1.31) | 1.57 (1.14–2.15) | ||
| Maternal age, years | |||||
| <20 | 3.1 | 1.36 (1.22–1.51) | 1.34 (1.20–1.49) | 1.49 (1.26–1.76) | 1.53 (1.28–1.82) |
| 20–24 | 13.0 | 1.10 (1.04–1.17) | 1.09 (1.03–1.15) | 1.09 (0.99–1.22) | 1.09 (0.98–1.22) |
| 25–29 | 28.7 | Reference | Reference | Reference | Reference |
| 30–34 | 33.8 | 0.93 (0.89–0.98) | 0.93 (0.89–0.97) | 1.07 (0.98–1.16) | 1.05 (0.97–1.14) |
| 35–39 | 18.1 | 0.87 (0.83–0.92) | 0.86 (0.82–0.91) | 0.93 (0.85–1.03) | 0.90 (0.82–0.99) |
| >39 | 3.3 | 0.75 (0.68–0.83) | 0.74 (0.66–0.81) | 0.80 (0.65–0.98) | 0.76 (0.62–0.93) |
| Neighbourhood income level | |||||
| 1 (lowest) | 20.2 | 0.96 (0.90–1.02) | 0.83 (0.78–0.88) | 0.98 (0.88–1.09) | 0.85 (0.76–0.95) |
| 2 | 21.3 | 0.92 (0.87–0.97) | 0.82 (0.77–0.87) | 0.96 (0.87–1.07) | 0.86 (0.77–0.96) |
| 3 | 21.0 | 1.00 (0.95–1.06) | 0.92 (0.87–0.97) | 1.02 (0.92–1.13) | 0.94 (0.85–1.05) |
| 4 | 20.4 | 0.98 (0.92–1.03) | 0.93 (0.88–0.98) | 0.96 (0.87–1.07) | 0.92 (0.83–1.02) |
| 5 (highest) | 17.1 | Reference | Reference | Reference | Reference |
| Neighbourhood female postsecondary education | |||||
| 1 (lowest) | 25.3 | 1.27 (1.21–1.34) | 1.30 (1.23–1.37) | 1.29 (1.18–1.41) | 1.27 (1.15–1.41) |
| 2 | 25.1 | 1.20 (1.14–1.25) | 1.20 (1.15–1.27) | 1.18 (1.08–1.29) | 1.17 (1.06–1.28) |
| 3 | 24.7 | 1.10 (1.05–1.16) | 1.10 (1.05–1.16) | 1.10 (1.00–1.20) | 1.09 (0.99–1.19) |
| 4 (highest) | 24.9 | Reference | Reference | Reference | Reference |
| Residence indicator | |||||
| Rural | 10.9 | 1.18 (1.12–1.25) | 1.16 (1.10–1.23) | 1.12 (1.02–1.24) | 1.10 (1.00–1.21) |
| Urban | 89.1 | Reference | Reference | Reference | Reference |
*
Multivariate models are adjusted for sex, siblings, maternal smoking, breastfeeding, Aboriginal status, birth weight, maternal age, neighbourhood income, neighbourhood female education and residence