Table 3.
Regression model of low birth weight for Indigenous infants.
| Full Model |
Final Model |
||||||
|---|---|---|---|---|---|---|---|
| RR | (95% CI) | p | RR | (95% CI) | p | ||
| Maternal corrections history | Prison (before pregnancy) | 2.01 | (1.82–2.21) | <.001 | 2.02 | (1.84–2.22) | <.001 |
| Prison (during pregnancy) | 1.95 | (1.67–2.27) | <.001 | 1.96 | (1.68–2.29) | <.001 | |
| Prison (after birth) | 1.57 | (1.43–1.74) | <.001 | 1.58 | (1.44–1.74) | <.001 | |
| Community corrections | 1.31 | (1.20–1.43) | <.001 | 1.32 | (1.21–1.43) | <.001 | |
| No corrections record | ref. | ||||||
| Any placental disorder* | Yes | 2.99 | (2.47–3.63) | <.001 | 3.01 | (2.48–3.65) | <.001 |
| No | ref. | ||||||
| PROM | Yes | 2.72 | (2.49–2.97) | <.001 | 2.73 | (2.49–2.98) | <.001 |
| No | ref. | ||||||
| Renal disorder | Yes | 2.40 | (1.49–3.86) | <.001 | 2.40 | (1.50–3.87) | <.001 |
| No | ref. | ||||||
| Hypertension, preeclampsia | Yes | 2.17 | (1.95–2.41) | <.001 | 2.17 | (1.95–2.41) | <.001 |
| No | ref. | ||||||
| External injury hospitalisation | Yes | 1.57 | (1.41–1.74) | <.001 | 1.58 | (1.43–1.75) | <.001 |
| No | ref. | ||||||
| Socioeconomic status | Very low (0–5%) | 1.53 | (1.34–1.75) | <.001 | 1.53 | (1.33–1.75) | <.001 |
| Low (6–25%) | 1.40 | (1.22–1.59) | <.001 | 1.39 | (1.22–1.59) | <.001 | |
| Medium (26–50%) | 1.28 | (1.11–1.48) | .001 | 1.28 | (1.11–1.47) | .001 | |
| High (51–100%) | ref. | ||||||
| Maternal Indigenous status | Indigenous | 1.40 | (1.15–1.71) | .001 | 1.39 | (1.14–1.70) | .001 |
| Non-Indigenous | ref. | ||||||
| Substance use related contact** | Yes | 1.33 | (1.11–1.61) | .002 | 1.36 | (1.13–1.63) | .001 |
| No | ref. | ||||||
| Maternal age at time of birth | 35+-years | 1.32 | (1.13–1.54) | <.001 | 1.32 | (1.13–1.54) | <.001 |
| <35-years | ref. | ||||||
| Birth spacing | <18months | 1.23 | (1.12–1.35) | <.001 | 1.23 | (1.11–1.35) | <.001 |
| Firstborn/18months+ | ref. | ||||||
| Sex | Female | 1.19 | (1.11–1.27) | <.001 | 1.19 | (1.11–1.27) | <.001 |
| Male | ref. | ||||||
| Parity | Nulliparous | 1.18 | (1.09–1.28) | <.001 | 1.17 | (1.09–1.26) | <.001 |
| Parity 1–2 | ref. | ||||||
| Parity 3+ | 0.95 | (0.87–1.04) | .287 | 0.96 | (0.87–1.05) | .405 | |
| Birth year | 1.01 | (1.00–1.01) | .001 | 1.01 | (1.00–1.01) | .001 | |
| Sibling contact Child Protection | Yes | 1.06 | (0.91–1.22) | .479 | |||
| Firstborn/No | ref. | ||||||
| Previous abortion | Yes | 1.05 | (0.97–1.14) | .229 | |||
| No | ref. | ||||||
| Mental health related contact | Yes | 1.05 | (0.90–1.23) | .520 | |||
| No | ref. | ||||||
| Infection related hospitalisation | Yes | 1.01 | (0.91–1.14) | .801 | |||
| No | ref. | ||||||
| Observations | 24,951 | 24,951 | |||||
| AIC | 0.7291 | 0.7289 | |||||
| Log pseudolikelihood | -9071.42 | -9072.33 | |||||
*
Includes abruptio placentae, placenta previa, and other placental disorders.
**
Includes hospital admissions and mental health service contacts related to substance use, including alcohol and poisoning.