Mother referred N = 34,319 (100) | Univariate | Multivariable | ||
---|---|---|---|---|
Yes N (%) | No N (%) | RR (95%CI) | aRR (95%CI)a | |
n = 3236 (9.4%) | n = 31,083 (90.6) | |||
Maternal Age (Years) | ||||
< =25 | 2345 (72.5) | 21,367 (68.7) | 1.2*** (1.1–1.3) | 1.1** (1.0–1.2) |
25+ | 891 (27.5) | 9716 (31.3) | Referent | Referent |
Maternal Education | ||||
Illiterate or Primary | 592 (18.3) | 6267 (20.2) | Referent | Referent |
Secondary or Higher | 2638 (81.5) | 24,755 (79.6) | 1.2*** (1.1–1.3) | 1.1 (1.0–1.2) |
Missing | 6 (0.2) | 61 (0.2) | – | – |
Maternal BMI | ||||
< 21 | 1966 (60.9) | 19,461 (62.6) | 0.9 (0.9–1.0) | 1.0 (0.9–1.0) |
21–30 | 1197 (37.0) | 10,912 (35.1) | Referent | Referent |
30+ | 73 (2.1) | 710 (2.3) | 0.9 (0.7–1.1) | 0.9 (0.7–1.2) |
Maternal Anemia | ||||
None | 300 (9.3) | 2876 (9.3) | Referent | Referent |
Mild | 1359 (42.0) | 13,074 (42.1) | 0.9 (0.8–1.0) | 1.1 (1.0–1.3) |
Moderate or Severe | 1525 (47.1) | 14,617 (47.0) | 1.0 (0.9–1.0) | 1.2***(1.0–1.4) |
Missing | 52 (1.6) | 516 (1.6) | – | – |
Maternal Gestation | ||||
(weeks) | ||||
< 37 weeks | 511 (15.8) | 4193 (13.5) | 1.2*** (1.1–1.3) | 1.2***(1.1–1.3) |
> = 37 weeks | 2685 (83.0) | 26,517 (85.3) | Referent | Referent |
Missing | 40 (1.2) | 373 (1.2) | – | – |
Multiple Gestations | ||||
No | 3181 (98.3) | 30,874 (99.3) | Referent | Referent |
Yes | 55 (1.7) | 209 (0.7) | 2.1*** (1.6–2.8) | 1.6***(1.2–2.1) |
Fetal Heart Rate Present | ||||
No | 58 (1.8) | 240 (0.8) | 2.1*** (1.6–2.8) | 1.7***(1.3–2.2) |
Yes | 3122 (96.5) | 30,619 (98.5) | Referent | Referent |
Missing | 56 (1.7) | 224 (0.7) | – | – |
Interaction term | ||||
Primigravida - No PRCb | 1001 (30.9) | 12,498 (40.2) | 1.4***(1.3–1.6) | 1.4***(1.3–1.6) |
Primigravida - PRC | 944 (29.2) | 2437 (7.8) | 5.0***(4.0–6.3) | 4.7***(3.8–5.8) |
Multigravida - No PRC | 813 (25.1) | 14,714 (47.4) | Referent | Referent |
Multigravida - PRC | 478 (14.8) | 1428 (4.6) | 4.4***(3.6–5.6) | 4.2***(3.4–5.2) |