Unadjusted and adjusted relative risks for rapid repeat pregnancy occurring within 12 months of a prior live birth among women with and without intellectual and developmental disabilities
| Measure | No. (%) with rapid repeat pregnancy | Unadjusted RR (95% CI) | Model 1* adjusted RR (95% CI) | Model 2† adjusted RR (95% CI) |
|---|---|---|---|---|
| Intellectual and developmental disabilities | ||||
| Absent (n = 923 367) | 35 948 (3.9) | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
| Present (n = 2855) | 216 (7.6) | 1.94 (1.70–2.22) | 1.34 (1.18–1.54) | 1.00 (0.87–1.14) |
| Age, yr | ||||
| ≥ 25 | 21 555 (2.9) | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
| < 25 | 14 609 (8.6) | 3.02 (2.96–3.09) | 3.20 (3.13–3.27) | 2.75 (2.69–2.82) |
| Parity at the index live birth | ||||
| Primiparous | 27 211 (3.9) | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
| Multiparous | 8953 (4.0) | 1.03 (1.01–1.06) | 1.28 (1.25–1.31) | 1.22 (1.19–1.26) |
| Region of residence | ||||
| Rural | 3028 (3.4) | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
| Urban | 33 121 (4.0) | 1.15 (1.11–1.20) | 1.39 (1.34–1.44) | 1.35 (1.30–1.40) |
| Neighbourhood income quintile | ||||
| Q3–Q5 (mid to highest) | 16 016 (3.0) | 1.00 (ref) | NA | 1.00 (ref) |
| Q1–Q2 (lowest) | 19 932 (5.3) | 1.79 (1.75–1.82) | NA | 1.46 (1.43–1.49) |
| Social assistance | ||||
| Not receiving | 32 609 (3.7) | 1.00 (ref) | NA | 1.00 (ref) |
| Receiving | 3555 (10.1) | 2.75 (2.66–2.85) | NA | 1.71 (1.65–1.77) |
| Stable chronic medical condition | ||||
| Absent | 26 887 (4.0) | 1.00 (ref) | NA | 1.00 (ref) |
| Present | 9277 (3.7) | 0.92 (0.90–0.94) | NA | 0.97 (0.95–1.00) |
| Unstable chronic medical condition | ||||
| Absent | 31 610 (3.9) | 1.00 (ref) | NA | 1.00 (ref) |
| Present | 4554 (3.7) | 0.94 (0.92–0.97) | NA | 0.97 (0.94–1.00) |
| Mental illness or substance use disorder | ||||
| Absent | 24 242 (3.7) | 1.00 (ref) | NA | 1.00 (ref) |
| Present | 11 922 (4.5) | 1.23 (1.21–1.26) | NA | 1.13 (1.11–1.16) |
| Continuity of primary care | ||||
| Moderate to high continuity | 24 825 (3.6) | 1.00 (ref) | NA | 1.00 (ref) |
| Infrequent use or low continuity | 11 339 (4.7) | 1.29 (1.26–1.32) | NA | 1.16 (1.14–1.19) |
Note: CI = confidence interval, NA = not applicable, ref = reference, RR = relative risk.
↵* Model 1 was adjusted for the following demographic factors: age, parity and rurality of residence.
↵† Model 2 was additionally adjusted for the following social, health and health care factors that might explain the impact of disability status on risk of rapid repeat pregnancy: neighbourhood income quintile, social assistance, chronic medical conditions, mental illness and continuity of primary care.