Baseline characteristics of women with and without intellectual and developmental disabilities in a study of rapid repeat pregnancy
| Characteristic | Study group; no. (%) of women* | Standardized difference† | |
|---|---|---|---|
| With disabilities n = 2855 | Without disabilities n = 923 367 | ||
| Age, yr, mean ± SD | 26.3 ± 6.4 | 29.7 ± 5.5 | |
| ≤ 19 | 413 (14.5) | 32 704 (3.5) | 0.39 |
| 20–24 | 923 (32.3) | 135 541 (14.7) | 0.42 |
| 25–29 | 665 (23.3) | 277 101 (30.0) | −0.15 |
| 30–34 | 489 (17.1) | 298 993 (32.4) | −0.36 |
| 35–39 | 283 (9.9) | 146 022 (15.8) | −0.18 |
| ≥ 40 | 82 (2.9) | 33 006 (3.6) | −0.04 |
| Multiparous at the index live birth | 811 (28.4) | 223 163 (24.2) | 0.10 |
| Urban residence‡ | 2453 (86.0) | 834 993 (90.5) | −0.14 |
| Neighbourhood income quintile§ | |||
| Q1 (lowest) | 1105 (39.0) | 195 423 (21.3) | 0.39 |
| Q2 | 612 (21.6) | 181 885 (19.8) | 0.04 |
| Q3 | 452 (15.9) | 187 364 (20.4) | −0.12 |
| Q4 | 361 (12.7) | 193 269 (21.0) | −0.22 |
| Q5 (highest) | 306 (10.8) | 161 906 (17.6) | −0.20 |
| Receipt of social assistance | 1124 (39.4) | 34 135 (3.7) | 0.96 |
| Stable chronic medical condition | 1039 (36.4) | 251 995 (27.3) | 0.20 |
| Unstable chronic medical condition | 601 (21.1) | 121 993 (13.2) | 0.21 |
| Psychotic mental illness | 108 (3.8) | 1457 (0.2) | 0.26 |
| Nonpsychotic mental illness | 1428 (50.0) | 253 420 (27.4) | 0.47 |
| Substance use disorder | 242 (8.5) | 19 173 (2.1) | 0.29 |
| Continuity of primary care ≤ 2 yr before the index live birth | |||
| Infrequent use (< 3 primary care visits in 2 yr) | 119 (4.2) | 46 205 (5.0) | −0.04 |
| Low (< 50% visits to same provider) | 795 (27.8) | 195 270 (21.2) | 0.16 |
| Moderate (50%–79% visits to same provider) | 1025 (35.9) | 332 006 (36.0) | 0.00 |
| High (≥ 80% visits to same provider) | 916 (32.1) | 349 886 (37.9) | −0.12 |
Note: SD = standard deviation.
↵* Except where indicated otherwise.
↵† Standardized differences > 0.10 are considered to be clinically meaningful.29
↵‡ n = 215 (0.02%) observations had missing data; among women with intellectual and developmental disabilities, the number with missing data was too small to allow missing data to be reported separately by group.
↵§ n = 3539 (0.4%) observations had missing data, consisting of 19 (0.7%) among women with intellectual and developmental disabilities and 3520 (0.4%) among women without such disabilities.