Table 1.
Factors associated with differing interdelivery intervals
| Variable | Interdelivery interval < 18 months | Interdelivery interval 18–60 months | Interdelivery interval > 60 months | p-Valuea |
|---|---|---|---|---|
| Diabetes in the index pregnancy | ||||
| No diabetes | 1,392 (95.5)b | 9,964 (97.0) | 514 (96.4) | 0.02 |
| Diet-controlled gestational diabetes | 48 (3.3) | 211 (2.1) | 11 (2.1) | |
| Medication-requiring gestational diabetes | 17 (1.2) | 98 (1.0) | 8 (1.5) | |
| BMI change | ||||
| Lost > 2 kg/m2 | 148 (10.2) | 921 (9.0) | 33 (6.2) | < 0.001 |
| Lost < 2 to gained < 2 kg/m2 | 1,149 (78.9) | 8,073 (78.6) | 318 (59.7) | |
| Gained 2–4 kg/m2 or more | 116 (8.0) | 884 (8.6) | 92 (17.3) | |
| Gained 4 kg/m2 or more | 44 (3.0) | 395 (3.9) | 90 (16.9) | |
| Parityc | ||||
| One | 1,200 (82.4) | 8,867 (86.3) | 331 (62.1) | < 0.001 |
| More than one | 257 (17.6) | 1,406 (13.7) | 202 (37.9) | |
| Maternal BMI at index pregnancy (kg/m2)d | 28.9 (26.6, 32.8) | 28.5 (26.1, 31.7) | 29.4 (26.6, 33.1) | < 0.001 |
| Maternal age (years)d | 31.5 (28.4, 34.3) | 31.6 (29.3, 33.9) | 28.6 (23.3, 31.9) | < 0.001 |
| Maternal race | ||||
| White non-Hispanic | 943 (64.7) | 7,392 (72.0) | 168 (31.5) | < 0.001 |
| Black non-Hispanic | 154 (10.6) | 544 (5.3) | 70 (13.1) | |
| Hispanic | 285 (19.6) | 1,663 (16.2) | 260 (48.8) | |
| Asian | 75 (5.2) | 674 (6.6) | 35 (6.6) | |
| N | 1,457 | 10,273 | 533 | |
Abbreviation: BMI, body mass index
a
The p-value for Kruskal–Wallis’ tests for continuous variables and chi-square tests for categorical variables.
b
Data are presented as median ± interquartile range for continuous variable or N (%) for categorical variables.
c
Measured at the time of subsequent delivery.
d
Measured at the time of index delivery.